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v3.21.1

Consolidated Statements of Changes in Stockholders’ (Deficit) Equity - USD ($) $ in Thousands | Total | Common stock | Additional paid-in capital | Accumulated deficit | Accumulated other comprehensive loss
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2019 |  | 86,325,547 |  |  |
Beginning balance at Dec. 31, 2019 | $ 8,397 | $ 9 | $ 348,664 | $ (335,753) | $ (4,523)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 78,583 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 114 |  | 114 |  |
Issuance of common stock upon exercise of options (in shares) |  | 5,128 |  |  |
Issuance of common stock upon exercise of options | 3 |  | 3 |  |
Issuance of vested restricted stock units (in shares) |  | 10,937 |  |  |
Issuance of vested restricted stock units | 0 |  |  |  |
Issuance of common stock through at-the-market offering, net (in shares) |  | 598,977 |  |  |
Issuance of common stock through at-the-market offering, net | 1,141 |  | 1,141 |  |
Other financing fees | (147) |  | (147) |  |
Stock-based compensation expense | 1,409 |  | 1,409 |  |
Currency translation adjustment | (60) |  |  |  | (60)
Unrealized (losses) on marketable securities | 0 |  |  |  |
Net loss | (19,620) |  |  | (19,620) |
Ending balance (in shares) at Mar. 31, 2020 |  | 87,019,172 |  |  |
Ending balance at Mar. 31, 2020 | $ (8,763) | $ 9 | 351,184 | (355,373) | (4,583)
Beginning balance (in shares) at Dec. 31, 2020 | 108,071,249 | 108,071,249 |  |  |
Beginning balance at Dec. 31, 2020 | $ (18,006) | $ 11 | 391,175 | (404,629) | (4,563)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 34,696 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | 72 |  | 72 |  |
Issuance of common stock upon exercise of options (in shares) |  | 153,278 |  |  |
Issuance of common stock upon exercise of options | 244 |  | 244 |  |
Issuance of vested restricted stock units (in shares) |  | 10,937 |  |  |
Issuance of vested restricted stock units | 0 |  |  |  |
Issuance of common stock through at-the-market offering, net (in shares) |  | 4,706,844 |  |  |
Issuance of common stock through at-the-market offering, net | 20,943 |  | 20,943 |  |
Stock-based compensation expense | 1,780 |  | 1,780 |  |
Currency translation adjustment | (6) |  |  |  | (6)
Unrealized (losses) on marketable securities | (1) |  |  |  | (1)
Net loss | $ (24,597) |  |  | (24,597) |
Ending balance (in shares) at Mar. 31, 2021 | 112,977,004 | 112,977,004 |  |  |
Ending balance at Mar. 31, 2021 | $ (19,571) | $ 11 | $ 414,214 | $ (429,226) | $ (4,570)

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