Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Consolidated Balance Sheet (Details)

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QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Apr. 02, 2016
Mar. 31, 2016
Current Assets                      
Cash and cash equivalents $ 10,790 $ 10,926 $ 5,704 $ 10,227 $ 10,865 $ 10,309 $ 13,983 $ 8,661 $ 12,958    
Accounts Receivable, Net, Current 86,828 79,571 76,304 81,427 96,350 96,156 99,226 97,508 101,946    
Manufacturing inventories 18,440 15,563 21,084 30,666 34,428 35,461 34,712 36,686 36,274    
Service part inventories 19,070 18,551 18,642 19,397 21,889 19,061 19,915 19,788 19,849    
Other current assets 18,095 7,877 11,291 11,348 13,565 8,335 9,581 9,760 9,183    
Restricted cash 1,065 1,098 6,124 1,220 1,342 3,054 3,063 3,002 2,954    
Total Current Assets 154,288 133,586 139,149 154,285 178,439 172,376 180,480 175,405 183,164    
Long-term assets:                      
Property and equipment, less accumulated depreciation 8,437 8,773 8,925 9,361 9,698 10,226 10,420 10,137 10,876    
Intangible assets, less accumulated amortization 34 60 86 112 138 164 204 240 276    
Restricted cash, long-term 5,000 5,000 0 5,000 5,000 12,000 20,000 20,000 20,000    
Other long-term assets 5,112 7,572 6,034 8,500 9,364 8,663 6,546 6,305 6,926    
Total Assets 172,871 154,991 154,194 177,258 202,639 203,429 217,650 212,087 221,242    
Current liabilities                      
Accounts payable 37,395 38,774 45,021 51,601 62,646 57,142 48,488 44,494 40,826    
Accrued warranty 3,456       2,422   0 0 3,689 $ 3,448  
Deferred revenue, current 90,407 84,879 89,020 94,063 96,866 87,388 88,505 90,456 92,325    
Accrued restructuring charges, current 2,876 3,947 4,437 2,681 3,166 5,086 2,370 2,878 1,894    
Convertible subordinated debt, current   0 0 0   0 57,034 62,926 62,827    
Accrued compensation 17,117 14,705 15,559 15,182 19,460 20,144 22,255 21,218 23,789    
Other accrued liabilities 29,025 25,295 29,150 23,114 17,638 19,024 16,561 17,344 15,945    
Total current liabilities 178,470 169,100 310,701 195,641 207,276 188,784 235,213 239,316 237,606    
Long-term liabilities:                      
Accrued restructuring charges, long-term 0 0 0 2,432 2,653 3,098 3,615 4,045 4,388    
Long-term debt, net of current portion 145,621 1,500 127,514 9,000 115,986 0 76,491 61,734 66,676    
Deferred revenue, long-term 36,733 34,361 34,577 36,520 38,587 35,824 36,774 38,149 38,896    
Long-term debt, net of current portion   137,073 0 112,255   117,301 76,491 61,734      
Convertible subordinated debt, long-term             0        
Other long-term liabilities 11,827 10,695 10,564 11,823 11,604 11,126 11,036 10,402 12,972    
Total liabilities 372,651 351,229 355,842 358,671 376,106 356,133 363,129 353,646 360,538    
Commitment and contingencies (Note 13)            
Preferred stock:                      
Preferred Stock, Value, Issued 0 0 0 0 0 0 0 0 0    
Common stock:                      
Common Stock, Value, Issued 360 358 358 356 354 351 347 341 340    
Additional paid in capital   493,347 483,494 482,028   479,289 476,093 475,357 473,850    
Accumulated deficit (697,954) (688,543) (684,257) (662,640) (655,157) (631,224) (621,028) (615,930) (611,811)    
Accumulated other comprehensive income (1,410) (1,400) (1,243) (1,157) (274) (1,120) (891) (1,327) (1,675)    
Total stockholders' deficit (199,780) (196,238) (201,648) (181,413) (173,467) (152,704) (145,479) (141,559) (139,296)   $ (143,098)
Total liabilities and stockholders' deficit $ 172,871 $ 154,991 $ 154,194 $ 177,258 $ 202,639 $ 203,429 217,650 212,087 221,242    
As Reported                      
Current Assets                      
Cash and cash equivalents             9,504 8,661 12,958    
Accounts Receivable, Net, Current             105,771 109,418 116,056    
Manufacturing inventories             29,119 27,821 27,661    
Service part inventories             19,915 19,788 19,849    
Other current assets             8,795 10,005 9,969    
Restricted cash             1,969 1,891 1,832    
Total Current Assets             175,073 177,584 188,325    
Long-term assets:                      
Property and equipment, less accumulated depreciation             10,745 10,455 11,186    
Intangible assets, less accumulated amortization             204 240 276    
Restricted cash, long-term             20,000 20,000 20,000    
Other long-term assets             5,127 4,753 5,240    
Total Assets             211,149 213,032 225,027    
Current liabilities                      
Accounts payable             48,488 45,007 41,611    
Accrued warranty             2,950 3,161 3,263    
Deferred revenue, current             77,090 79,996 84,683    
Accrued restructuring charges, current             1,743 2,249 869    
Convertible subordinated debt, current             57,034 62,926 62,827    
Accrued compensation             23,179 22,186 24,104    
Other accrued liabilities             12,927 13,309 12,998    
Total current liabilities             223,411 228,834 230,355    
Long-term liabilities:                      
Accrued restructuring charges, long-term             423 544 481    
Long-term debt, net of current portion             70,631 60,219 65,028    
Deferred revenue, long-term             35,906 36,697 37,642    
Long-term debt, net of current portion             70,631 60,219      
Convertible subordinated debt, long-term             0        
Other long-term liabilities             5,112 4,736 7,520    
Total liabilities             335,483 331,030 341,026    
Commitment and contingencies (Note 13)                    
Preferred stock:                      
Preferred Stock, Value, Issued             0 0 0    
Common stock:                      
Common Stock, Value, Issued             347 341 340    
Additional paid in capital             476,409 475,357 473,850    
Accumulated deficit             (604,832) (596,969) (593,295)    
Accumulated other comprehensive income             3,742 3,273 3,106    
Total stockholders' deficit             (124,334) (117,998) (115,999)   $ (125,885)
Total liabilities and stockholders' deficit             211,149 213,032 225,027    
Restatement Adjustments                      
Current Assets                      
Cash and cash equivalents             4,479 0      
Accounts Receivable, Net, Current             (6,545) (11,910) (14,110)    
Manufacturing inventories             5,593 8,865 8,613    
Service part inventories             0 0      
Other current assets             786 (245) (786)    
Restricted cash             1,094 1,111 1,122    
Total Current Assets             5,407 (2,179) (5,161)    
Long-term assets:                      
Property and equipment, less accumulated depreciation             (325) (318) (310)    
Intangible assets, less accumulated amortization             0 0      
Restricted cash, long-term             0 0      
Other long-term assets             1,419 1,552 1,686    
Total Assets             6,501 (945) (3,785)    
Current liabilities                      
Accounts payable             0 (513) (785)    
Accrued warranty             (2,950) (3,161) (3,263)    
Deferred revenue, current             11,415 10,460 7,642    
Accrued restructuring charges, current             627 629 1,025    
Convertible subordinated debt, current             0 0      
Accrued compensation             (924) (968) (315)    
Other accrued liabilities             3,634 4,035 2,947    
Total current liabilities             11,802 10,482 7,251    
Long-term liabilities:                      
Accrued restructuring charges, long-term             3,192 3,501 3,907    
Long-term debt, net of current portion             5,860 1,515 1,648    
Deferred revenue, long-term             868 1,452 1,254    
Long-term debt, net of current portion             5,860 1,515      
Convertible subordinated debt, long-term             0        
Other long-term liabilities             5,924 5,666 5,452    
Total liabilities             27,646 22,616 19,512    
Commitment and contingencies (Note 13)                    
Preferred stock:                      
Preferred Stock, Value, Issued             0 0 0    
Common stock:                      
Common Stock, Value, Issued             0 0 0    
Additional paid in capital             (316) 0      
Accumulated deficit             (16,196) (18,961) (18,516)    
Accumulated other comprehensive income             (4,633) (4,600) (4,781)    
Total stockholders' deficit             21,145 (23,561) (23,297)    
Total liabilities and stockholders' deficit             $ 6,501 $ (945) $ (3,785)