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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss | Adjustment | Adjustment Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 148,535 | $ 67 | $ (3) | $ 436,557 | $ (283,562) | $ (4,524) | $ (729) | $ (729)
Beginning balance (in shares) at Dec. 31, 2019 |  | 66,543,073 | (2,709,830) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued upon exercise of stock options | 1,955 |  |  | 1,955 |  |  |  |
Common stock issued upon exercise of stock options (in shares) |  | 199,215 |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (RSU) | 0 |  |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (in shares) |  | 203,690 |  |  |  |  |  |
Common stock as earn-out payment in connection with AdvantageTec Inc. | 294 | $ 1 |  | 293 |  |  |  |
Common stock as earnout payment in connection with AdvantageTec Inc. (in shares) |  | 11,508 |  |  |  |  |  |
Stock-based compensation | 9,519 |  |  | 9,519 |  |  |  |
Cash awards settled in shares of the Company’s common stock | 24,656 |  |  | 24,656 |  |  |  |
Cash awards settled in shares of the company's common stock (in shares) |  | 991,905 |  |  |  |  |  |
Common stock issued under Employee Stock Purchase Plan | 1,626 |  |  | 1,626 |  |  |  |
Common stock issued under Employee Stock Purchase Plan (in shares) |  | 50,818 |  |  |  |  |  |
Net loss | (37,001) |  |  |  | (37,001) |  |  |
Other comprehensive loss | (2,469) |  |  |  |  | (2,469) |  |
Ending balance at Mar. 31, 2020 | 146,386 | $ 68 | $ (3) | 474,606 | (321,292) | (6,993) |  |
Ending balance (in shares) at Mar. 31, 2020 |  | 68,000,209 | (2,709,830) |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 148,535 | $ 67 | $ (3) | 436,557 | (283,562) | (4,524) | $ (729) | $ (729)
Beginning balance (in shares) at Dec. 31, 2019 |  | 66,543,073 | (2,709,830) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss | (55,628) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | 143,314 | $ 69 | $ (3) | 488,229 | (339,919) | (5,062) |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 68,731,477 | (2,709,830) |  |  |  |  |
Beginning balance at Mar. 31, 2020 | 146,386 | $ 68 | $ (3) | 474,606 | (321,292) | (6,993) |  |
Beginning balance (in shares) at Mar. 31, 2020 |  | 68,000,209 | (2,709,830) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued upon exercise of stock options | 5,079 |  |  | 5,079 |  |  |  |
Common stock issued upon exercise of stock options (in shares) |  | 403,443 |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (RSU) | 1 | $ 1 |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (in shares) |  | 298,114 |  |  |  |  |  |
Stock-based compensation | 7,433 |  |  | 7,433 |  |  |  |
Common stock issued under Employee Stock Purchase Plan | 1,111 |  |  | 1,111 |  |  |  |
Common stock issued under Employee Stock Purchase Plan (in shares) |  | 29,711 |  |  |  |  |  |
Net loss | (18,627) |  |  |  | (18,627) |  |  |
Other comprehensive loss | 1,931 |  |  |  |  | 1,931 |  |
Ending balance at Jun. 30, 2020 | 143,314 | $ 69 | $ (3) | 488,229 | (339,919) | (5,062) |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 68,731,477 | (2,709,830) |  |  |  |  |
Beginning balance at Dec. 31, 2020 | 243,934 | $ 70 | $ (3) | 635,672 | (391,885) | 80 |  |
Beginning balance (in shares) at Dec. 31, 2020 |  | 70,264,265 | (2,709,830) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued upon exercise of stock options | 2,617 |  |  | 2,617 |  |  |  |
Common stock issued upon exercise of stock options (in shares) |  | 209,185 |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (RSU) | 0 | $ 1 |  | (1) |  |  |  |
Common stock issued upon vesting of restricted stock units (in shares) |  | 454,508 |  |  |  |  |  |
Stock-based compensation | 9,225 |  |  | 9,225 |  |  |  |
Cash awards settled in shares of the Company’s common stock | 25,925 |  |  | 25,925 |  |  |  |
Cash awards settled in shares of the company's common stock (in shares) |  | 400,700 |  |  |  |  |  |
Common stock issued under Employee Stock Purchase Plan | 1,257 |  |  | 1,257 |  |  |  |
Common stock issued under Employee Stock Purchase Plan (in shares) |  | 22,544 |  |  |  |  |  |
Net loss | (21,195) |  |  |  | (21,195) |  |  |
Other comprehensive loss | (1,746) |  |  |  |  | (1,746) |  |
Ending balance at Mar. 31, 2021 | 260,017 | $ 71 | $ (3) | 674,695 | (413,080) | (1,666) |  |
Ending balance (in shares) at Mar. 31, 2021 |  | 71,351,202 | (2,709,830) |  |  |  |  |
Beginning balance at Dec. 31, 2020 | $ 243,934 | $ 70 | $ (3) | 635,672 | (391,885) | 80 |  |
Beginning balance (in shares) at Dec. 31, 2020 |  | 70,264,265 | (2,709,830) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued upon exercise of stock options (in shares) | 461,000 |  |  |  |  |  |  |
Net loss | $ (42,314) |  |  |  |  |  |  |
Ending balance at Jun. 30, 2021 | 261,692 | $ 72 | $ (3) | 696,923 | (434,199) | (1,101) |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 72,017,145 | (2,709,830) |  |  |  |  |
Beginning balance at Mar. 31, 2021 | 260,017 | $ 71 | $ (3) | 674,695 | (413,080) | (1,666) |  |
Beginning balance (in shares) at Mar. 31, 2021 |  | 71,351,202 | (2,709,830) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Common stock issued upon exercise of stock options | 3,999 |  |  | 3,999 |  |  |  |
Common stock issued upon exercise of stock options (in shares) |  | 252,155 |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (RSU) | 0 | $ 1 |  | (1) |  |  |  |
Common stock issued upon vesting of restricted stock units (in shares) |  | 252,218 |  |  |  |  |  |
Stock-based compensation | 9,524 |  |  | 9,524 |  |  |  |
Cash awards settled in shares of the Company’s common stock | 7,578 |  |  | 7,578 |  |  |  |
Cash awards settled in shares of the company's common stock (in shares) |  | 137,300 |  |  |  |  |  |
Common stock issued under Employee Stock Purchase Plan | 1,128 |  |  | 1,128 |  |  |  |
Common stock issued under Employee Stock Purchase Plan (in shares) |  | 24,270 |  |  |  |  |  |
Net loss | (21,119) |  |  |  | (21,119) |  |  |
Other comprehensive loss | 565 |  |  |  |  | 565 |  |
Ending balance at Jun. 30, 2021 | $ 261,692 | $ 72 | $ (3) | $ 696,923 | $ (434,199) | $ (1,101) |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 72,017,145 | (2,709,830) |  |  |  |  |

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