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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands | Preferred stock | Common stock | Additional paid-in capital | Accumulated comprehensive (loss) income | Deficit | Total
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2018 | $ 0 | $ 0 | $ 555 | $ 0 | $ (210,596) | $ (210,041)
Balance, beginning of period (in shares) at Dec. 31, 2018 | 3,405 | 9,583,163 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Effect of exchange transaction |  |  |  |  | 10,956 | 10,956
Effect of exchange transaction (in shares) |  | (603,874) |  |  |  |
Issuance of warrants to purchase common stock |  |  | 1,217 |  |  | 1,217
Settlement of litigation (in shares) | (444) | (10,540) |  |  |  |
Issuance of common stock upon exercise of stock options and warrants |  |  | 36 |  |  | 36
Issuance of common stock upon exercise of stock options and warrants (in shares) |  | 423,933 |  |  |  |
Stock-based compensation |  |  | 1,531 |  |  | 1,531
Foreign currency translation adjustment |  |  |  | 54 |  | 54
Net loss |  |  |  |  | (59,414) | (59,414)
Balance, end of period at Dec. 31, 2019 |  |  | 3,339 | 54 | (259,054) | (255,661)
Balance, end of period (in shares) at Dec. 31, 2019 | 2,961 | 9,392,682 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation |  |  | 456 |  |  | 456
Foreign currency translation adjustment |  |  |  | 451 |  | 451
Net loss |  |  |  |  | (17,471) | (17,471)
Balance, end of period at Mar. 31, 2020 |  |  | 3,816 | 505 | (269,188) | (264,867)
Balance, end of period (in shares) at Mar. 31, 2020 |  | 8,997,741 |  |  |  |
Balance, beginning of period at Dec. 31, 2019 |  |  | 3,339 | 54 | (259,054) | (255,661)
Balance, beginning of period (in shares) at Dec. 31, 2019 | 2,961 | 9,392,682 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Effect of exchange transaction |  |  |  |  | 7,337 | 7,337
Effect of exchange transaction (in shares) |  | (466,711) |  |  |  |
Cancellation of exchange transaction by shareholder (in shares) |  | 1,034,135 |  |  |  |
Recognition of beneficial conversion feature related to convertible notes |  |  | 1,629 |  |  | 1,629
Issuance of warrants to purchase common stock |  |  | 168 |  |  | 168
Issuance of common stock upon exercise of stock options and warrants |  |  | 383 |  |  | $ 383
Issuance of common stock upon exercise of stock options and warrants (in shares) |  | 1,268,265 |  |  |  | 996,991
Stock-based compensation |  |  | 4,542 |  |  | $ 4,542
Foreign currency translation adjustment |  |  |  | (246) |  | (246)
Net loss |  |  |  |  | (156,124) | (156,124)
Balance, end of period at Dec. 31, 2020 |  |  | 10,061 | (192) | (407,841) | (397,972)
Balance, end of period (in shares) at Dec. 31, 2020 | 2,961 | 11,228,371 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Recognition of beneficial conversion feature related to convertible notes |  |  | 1,126 |  |  | $ 1,126
Issuance of common stock upon exercise of stock options and warrants (in shares) |  |  |  |  |  | 6,465,857
Stock-based compensation |  |  | 784 |  |  | $ 784
Foreign currency translation adjustment |  |  |  | 251 |  | 251
Net loss |  |  |  |  | (82,553) | (82,553)
Balance, end of period at Mar. 31, 2021 |  |  | $ 14,726 | $ 59 | $ (490,394) | $ (475,609)
Balance, end of period (in shares) at Mar. 31, 2021 |  | 17,694,228 |  |  |  |

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