Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL SUMMARY (Unaudited) - CONSOLIDATED STATEMENTS OF CASH FLOWS (Details)

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QUARTERLY FINANCIAL SUMMARY (Unaudited) - CONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Operating activities                              
Net income (loss) $ (18,943) $ (9,869) $ (3,331) $ (9,142) $ (10,176) $ 113 $ (7,424) $ (879) $ (12,473) $ (8,303) $ (22,342) $ (8,190) $ (41,286) $ (18,368) $ 38,355
Adjustments to reconcile net income (loss) to net cash used in operating activities:                              
Depreciation and amortization       2,752       2,586 5,295 5,133 7,593 7,235 9,313 10,118 9,418
Amortization of debt issuance costs       520       336 1,234 768 1,948 1,201 2,735 1,624 2,414
Long-term debt related costs       0       0   992   992 0 992 8,471
Provision for manufacturing and service inventories       516       1,631 892 9,946 3,328 11,334 6,490 18,052 5,740
Gain on PPP loan extinguishment       0       0 0 0 0 0 0 (10,000)
Stock-based compensation       1,901       3,069 2,831 5,357 3,741 8,340 4,721 10,750 13,829
Change in fair value of warrant liabilities 2,203 (2,213) (4,402) (726) 430 (4) (3,092) (7,582) (5,128) (10,675) (7,341) (10,678) (5,137) (10,250) (60,030)
Change in fair value of warrant liabilities       469         (3,933)   (6,146)   (3,943)    
Non-cash income tax benefit       0       0              
Non-cash loss on debt extinguishment       0       992   0   0      
Other non-cash       750       (1,469) 826 (2,918) 3,010 (3,193) 3,304 (2,067) (832)
Changes in assets and liabilities, net of effect of acquisitions:                              
Accounts receivable       6,255       4,677 21,109 8,264 12,616 (3,367) 4,846 (2,966) 3,651
Manufacturing inventories       (692)       (412) (2,070) 416 (3,099) (9,352) (1,396) (1,839) (12,069)
Service parts inventories       (516)       (1,384) (1,505) (1,971) (1,520) (2,671) 11,852 (3,503) (4,400)
Accounts payable       (5,421)       (175) (9,073) 293 (13,226) 7,015 (11,193) 1,158 (1,939)
Prepaid expenses       (2,287)       0 8 (1,208) 394 654 1,971 3,695 (3,959)
Deferred revenue       (2,929)       (15,393) (9,268) (20,933) (4,780) (19,817) 1,386 (11,611) (13,119)
Accrued restructuring charges       110       39 0 115 0 130 0 0 (580)
Accrued compensation       (816)       (1,610) (1,946) (2,949) (425) (614) 2,504 (431) (3,073)
Other assets       (1,422)       (3,000) (2,240) (835) (3,230) (1,455) (2,197) (1,270) (2,602)
Other liabilities       508       228 162 573 2,605 2,840 737 1,022 (3,003)
Net cash used in operating activities       (9,444)       (18,346) (10,151) (17,935) (19,533) (19,596) (10,156) (4,894) (33,728)
Investing activities                              
Purchases of property and equipment       (2,299)       (3,036) (3,925) (7,795) (5,025) (10,644) (5,869) (12,581) (6,316)
Business acquisitions               (2,000)   (2,000)   (2,000) 0 (3,020) (7,808)
Net cash used in investing activities       (2,299)       (5,036) (3,925) (9,795) (5,025) (12,644) (5,869) (15,601) (14,124)
Financing activities                              
Borrowings of long-term debt, net of debt issuance costs       12,889       0 12,889 0 12,889 0 12,541 0 94,961
Repayments of long-term debt       (1,997)       (20,846) (3,247) (22,096) (4,497) (23,346) (5,747) (24,596) (94,301)
Borrowings of credit facility       108,186       109,740 217,084 229,605 318,223 363,103 421,623 497,280 309,000
Repayments of credit facility       (107,834)       (110,575) (213,082) (226,240) (303,671) (353,502) (412,704) (498,665) (291,265)
Borrowings of paycheck protection program               0           0  
Proceeds from secondary offering, net               0           0  
Payment of taxes due upon vesting of restricted stock               0           0  
Proceeds from issuance of common stock       (9)       66,324 0 66,723 0 66,718 0 67,146 1,762
Net cash provided by financing activities       11,235       44,643 13,644 47,992 22,944 52,973 15,713 41,165 20,157
Effect of exchange rate changes on cash and cash equivalents       (2)       29 11 166 (12) 21 (3) 12 51
Net change in cash, cash equivalents, and restricted cash       (510)       21,290 (421) 20,428 (1,626) 20,754 (315) 20,682 (27,644)
Cash, cash equivalents, and restricted cash at beginning of period 24,549 25,754 25,665 26,175 26,247 25,921 26,783 5,493 26,175 5,493 26,175 5,493 26,175 5,493 33,137
Cash, cash equivalents, and restricted cash at end of period 25,860 24,549 25,754 25,665 26,175 26,247 25,921 26,783 25,754 25,921 24,549 26,247 25,860 26,175 5,493
Supplemental disclosure of cash flow information                              
Cash paid for interest       2,665       1,863 6,079 4,114 9,154 6,270 12,314 8,701 9,140
Cash paid for income taxes, net of refunds       307       115 831 465 1,136 837 1,776 1,418 944
Non-cash transactions                              
Purchases of property and equipment included in accounts payable       977       133 689 548 164 1,198 661 1,049 147
Paid-in-kind interest       191       319 777 319 1,401 319 2,314 319 0
Deemed dividend             0 0   0   0   0  
Cash and cash equivalents 25,692 24,377 25,574 25,465 25,963 26,028 25,698 26,528 25,574 25,698 24,377 26,028 25,692 25,963 5,210
Restricted cash, current $ 168 $ 172 180 200 212 219 223 255 180 223 172 219 168 212 283
Transfer of manufacturing inventory to services inventory                              
Non-cash transactions                              
Transfer of manufacturing inventory       (226)       890 (218) 1,905 75 2,308 341 4,045 211
Transfer of manufacturing inventory to property and equipment                              
Non-cash transactions                              
Transfer of manufacturing inventory       143       193 172 279 205 264 264 343 818
As previously reported                              
Operating activities                              
Net income (loss)       (10,576)   (2,170) (11,944) (10,220)   (22,164)   (24,334)   (37,943) (32,280)
Adjustments to reconcile net income (loss) to net cash used in operating activities:                              
Depreciation and amortization       2,752       2,586   5,133   7,235   10,118 9,418
Amortization of debt issuance costs       520       336   768   1,201   1,624 2,414
Long-term debt related costs       0         992   992   992 8,471
Provision for manufacturing and service inventories       516       1,631   9,946   11,334   18,052 5,740
Gain on PPP loan extinguishment       0       0   0         (10,000)
Stock-based compensation       1,901       3,069   5,357   8,340   10,750 13,829
Change in fair value of warrant liabilities       0   0 0 0   0   0   0 0
Change in fair value of warrant liabilities       0                      
Non-cash income tax benefit       0       0              
Non-cash loss on debt extinguishment       0       992              
Other non-cash       734       (1,469)   (2,918)   (3,193)   (2,067) (832)
Changes in assets and liabilities, net of effect of acquisitions:                              
Accounts receivable       6,255       4,677   8,264   (3,367)   (2,966) 3,651
Manufacturing inventories       (692)       (412)   416   (9,352)   (1,839) (12,069)
Service parts inventories       (516)       (1,384)   (1,971)   (2,671)   (3,503) (4,400)
Accounts payable       (5,421)       (175)   293   7,015   1,158 (1,939)
Prepaid expenses       (2,287)       0   (1,208)   654   3,695 (3,959)
Deferred revenue       (2,221)       (13,634)   (17,747)   (14,351)   (2,286) (2,514)
Accrued restructuring charges       110       39   115   130     (580)
Accrued compensation       (816)       (1,610)   (2,949)   (614)   (431) (3,073)
Other assets       (1,422)       (3,000)   (835)   (1,455)   (1,270) (2,602)
Other liabilities       508       228   573   2,840   1,022 (3,003)
Net cash used in operating activities       (10,655)       (18,346)   (17,935)   (19,596)   (4,894) (33,728)
Investing activities                              
Purchases of property and equipment       (2,299)       (3,036)   (7,795)   (10,644)   (12,581) (6,316)
Business acquisitions               (2,000)   (2,000)   (2,000)   (3,020) (7,808)
Net cash used in investing activities       (2,299)       (5,036)   (9,795)   (12,644)   (15,601) (14,124)
Financing activities                              
Borrowings of long-term debt, net of debt issuance costs       14,100       0   0   0   0 94,961
Repayments of long-term debt       (1,997)       (20,846)   (22,096)   (23,346)   (24,596) (94,301)
Borrowings of credit facility       108,186       109,740   229,605   363,103   497,280 309,000
Repayments of credit facility       (107,834)       (110,575)   (226,240)   (353,502)   (498,665) (291,265)
Borrowings of paycheck protection program               0           0  
Proceeds from secondary offering, net               0           0  
Payment of taxes due upon vesting of restricted stock               0           0  
Proceeds from issuance of common stock       (9)       66,324   66,723   66,718   67,146 1,762
Net cash provided by financing activities       12,446       44,643   47,992   52,973   41,165 20,157
Effect of exchange rate changes on cash and cash equivalents       (2)       29   166   21   12 51
Net change in cash, cash equivalents, and restricted cash       (510)       21,290   20,428   20,754   20,682 (27,644)
Cash, cash equivalents, and restricted cash at beginning of period     25,665 26,175 26,247 25,921 26,783 5,493 26,175 5,493 26,175 5,493 26,175 5,493 33,137
Cash, cash equivalents, and restricted cash at end of period       25,665 26,175 26,247 25,921 26,783   25,921   26,247   26,175 5,493
Supplemental disclosure of cash flow information                              
Cash paid for interest       2,665       1,863   4,114   6,270   8,701 9,140
Cash paid for income taxes, net of refunds       307       115   465   837   1,418 944
Non-cash transactions                              
Purchases of property and equipment included in accounts payable       977       133   548   1,198   1,049 147
Paid-in-kind interest       191       319   319   319   319  
Deemed dividend             0 389   389   389   389  
Cash and cash equivalents       25,465 25,963 26,028 25,698 26,528   25,698   26,028   25,963 5,210
Restricted cash, current       200 212 219 223 255   223   219   212 283
As previously reported | Transfer of manufacturing inventory to services inventory                              
Non-cash transactions                              
Transfer of manufacturing inventory       (226)       890   1,905   2,308   4,045 211
As previously reported | Transfer of manufacturing inventory to property and equipment                              
Non-cash transactions                              
Transfer of manufacturing inventory       143       193   279   264   343  
Adjustments                              
Operating activities                              
Net income (loss)       1,434   2,283 4,520 9,341   13,861   16,144   19,575 70,635
Adjustments to reconcile net income (loss) to net cash used in operating activities:                              
Depreciation and amortization       0       0   0   0   0 0
Amortization of debt issuance costs       0       0   0   0   0 0
Long-term debt related costs       0       0   0   0   0 0
Provision for manufacturing and service inventories       0       0   0   0   0 0
Gain on PPP loan extinguishment       0       0   0         0
Stock-based compensation       0       0   0   0   0
Change in fair value of warrant liabilities       (726)   (4) (3,092) (7,582)   (10,675)   (10,678)   (10,250) (60,030)
Change in fair value of warrant liabilities       469                      
Non-cash income tax benefit       0       0              
Non-cash loss on debt extinguishment       0       0              
Other non-cash       16       0   0   0   0 0
Changes in assets and liabilities, net of effect of acquisitions:                              
Accounts receivable       0       0   0   0   0 0
Manufacturing inventories       0       0   0   0   0 0
Service parts inventories       0       0   0   0   0 0
Accounts payable       0       0   0   0   0 0
Prepaid expenses       0       0   0   0   0 0
Deferred revenue       (708)       (1,759)   (3,186)   (5,466)   (9,325) (10,605)
Accrued restructuring charges       0       0   0   0     0
Accrued compensation       0       0   0   0   0 0
Other assets       0       0   0   0   0 0
Other liabilities       0       0   0   0   0 0
Net cash used in operating activities       1,211       0   0   0   0 0
Investing activities                              
Purchases of property and equipment       0       0   0   0   0 0
Business acquisitions               0   0   0   0 0
Net cash used in investing activities       0       0   0   0   0 0
Financing activities                              
Borrowings of long-term debt, net of debt issuance costs       (1,211)       0   0   0   0 0
Repayments of long-term debt       0       0   0   0   0 0
Borrowings of credit facility       0       0   0   0   0 0
Repayments of credit facility       0       0   0   0   0 0
Borrowings of paycheck protection program               0           0  
Proceeds from secondary offering, net               0           0  
Payment of taxes due upon vesting of restricted stock               0           0  
Proceeds from issuance of common stock       0       0   0   0   0
Net cash provided by financing activities       (1,211)       0   0   0   0 0
Effect of exchange rate changes on cash and cash equivalents       0       0   0   0   0 0
Net change in cash, cash equivalents, and restricted cash       0       0   0   0   0 0
Cash, cash equivalents, and restricted cash at beginning of period     $ 0 0 0 0 0 0 $ 0 0 $ 0 0 $ 0 0 0
Cash, cash equivalents, and restricted cash at end of period       0 0 0 0 0   0   0   0 0
Supplemental disclosure of cash flow information                              
Cash paid for interest       0       0   0   0   0 0
Cash paid for income taxes, net of refunds       0       0   0   0   0 0
Non-cash transactions                              
Purchases of property and equipment included in accounts payable       0       0   0   0   0 0
Paid-in-kind interest       0       0   0   0   0  
Deemed dividend             0 (389)   (389)   (389)   (389)  
Cash and cash equivalents       0 0 0 0 0   0   0   0 0
Restricted cash, current       0 $ 0 $ 0 $ 0 0   0   0   0 0
Adjustments | Transfer of manufacturing inventory to services inventory                              
Non-cash transactions                              
Transfer of manufacturing inventory       0       0   0   0   0 $ 0
Adjustments | Transfer of manufacturing inventory to property and equipment                              
Non-cash transactions                              
Transfer of manufacturing inventory       $ 0       $ 0   $ 0   $ 0   $ 0