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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Statement of Income and Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (4,982) | $ (5,216) | $ (5,231) | $ (6,076) | $ (3,824) | $ (4,620) | $ (1,768) | $ (125) | $ (21,505) | $ (10,337) | $ 163
Net unrealized gain (loss) on available-for-sale investments |  |  |  |  |  |  |  |  | (91) | 108 | 105
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | $ (21,596) | $ (10,229) | $ 268

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