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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss | Non- Controlling Interest
--- | --- | --- | --- | --- | --- | ---
Beginning Balances (in shares) at Dec. 31, 2018 |  | 102,187,471 |  |  |  |
Beginning Balances at Dec. 31, 2018 | $ 367,257 | $ 1,022 | $ 929,632 | $ (562,696) | $ (1,440) | $ 739
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and in connection with restricted stock units, net of tax (in shares) |  | 141,281 |  |  |  |
Issuance of common stock upon exercise of stock options and in connection with restricted stock units, net of tax | 216 | $ 1 | 215 |  |  |
Issuance costs related to public offering | (258) |  | (258) |  |  |
Stock-based compensation | 4,523 |  | 4,523 |  |  |
Foreign currency translation adjustment | (1,504) |  |  |  | (1,504) |
Net unrealized gain (loss) on marketable securities | 253 |  |  |  | 253 |
Net loss | (42,203) |  |  | (42,150) |  | (53)
Ending Balances (in shares) at Mar. 31, 2019 |  | 102,328,752 |  |  |  |
Ending Balances at Mar. 31, 2019 | 329,181 | $ 1,023 | 934,112 | (603,949) | (2,691) | 686
Beginning Balances (in shares) at Dec. 31, 2019 |  | 115,972,708 |  |  |  |
Beginning Balances at Dec. 31, 2019 | 432,739 | $ 1,160 | 1,090,828 | (656,985) | (2,449) | 185
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock upon exercise of stock options and in connection with restricted stock units, net of tax (in shares) |  | 305,845 |  |  |  |
Issuance of common stock upon exercise of stock options and in connection with restricted stock units, net of tax | 409 | $ 3 | 406 |  |  |
Stock-based compensation | 5,620 |  | 5,620 |  |  |
Foreign currency translation adjustment | (1,633) |  |  |  | (1,633) |
Net unrealized gain (loss) on marketable securities | 254 |  |  |  | 254 |
Net loss | (42,974) |  |  | (42,913) |  | (61)
Ending Balances (in shares) at Mar. 31, 2020 |  | 116,278,553 |  |  |  |
Ending Balances at Mar. 31, 2020 | $ 394,415 | $ 1,163 | $ 1,096,854 | $ (699,898) | $ (3,828) | $ 124

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