NET LOSS PER SHARE - Computation of Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Numerator: | ||||||||||||||||
| Net loss | $ (9,410) | $ (4,285) | $ (21,617) | $ (7,485) | $ (23,929) | $ (10,199) | $ (5,099) | $ (4,119) | $ (29,103) | $ (9,218) | $ (9,218) | $ (33,387) | $ (19,417) | $ (42,797) | $ (43,346) | $ (2,408) |
| Denominator: | ||||||||||||||||
| Weighted average shares - basic and diluted | 35,710 | 35,552 | 35,502 | 35,444 | 35,263 | 34,820 | 34,580 | 34,093 | 35,473 | 34,338 | 35,500 | 34,499 | 35,551 | 34,687 | 33,742 | |
| Basic net loss per share | $ (0.15) | $ (0.12) | $ (0.27) | $ (1.20) | $ (1.25) | $ (0.07) | ||||||||||
| Diluted net loss per share | $ (0.26) | $ (0.12) | $ (0.61) | $ (0.21) | $ (0.68) | $ (0.29) | $ (0.15) | $ (0.12) | $ (0.82) | $ (0.27) | $ (0.27) | $ (0.94) | $ (0.56) | $ (1.20) | $ (1.25) | $ (0.07) |
| X | ||||||||||
- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). No definition available.
|