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Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Common Stock | Treasury Stock | Additional Paid in Capital Cumulative Effect, Period of Adoption, Adjustment | Additional Paid in Capital | Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit | Other Comprehensive Income | Cumulative Effect, Period of Adoption, Adjustment | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2017 | $ 1 |  | $ 213 | $ 6,933 | $ (213) | $ (104,556) |  |  | $ (97,622)
Balance at beginning of period (in shares) at Dec. 31, 2017 | 5,690,083 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders’ Equity |  |  |  |  |  |  |  |  |
Repurchase of convertible preferred stock |  |  |  |  |  | (425) |  |  | (425)
Repurchase of common stock |  | $ (884) |  |  |  | (321) |  |  | (1,205)
Repurchase of common stock (in shares) | (589,321) |  |  |  |  |  |  |  |
Non-cash contribution |  |  |  | 414 |  |  |  |  | 414
Stock option exercise |  |  |  | 65 |  |  |  |  | 65
Stock option exercises (in shares) | 54,645 |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  | 2,997 |  |  |  |  | 2,997
Net income |  |  |  |  |  | 661 |  |  | 661
Balance at end of period at Dec. 31, 2018 | $ 1 | (884) |  | 10,622 |  | (104,854) |  |  | (95,115)
Balance at end of period (in shares) at Dec. 31, 2018 | 5,155,407 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders’ Equity |  |  |  |  |  |  |  |  |
Repurchase of common stock |  | (125) |  |  |  | (60) |  |  | (185)
Repurchase of common stock (in shares) | (26,659) |  |  |  |  |  |  |  |
Stock option exercise |  |  |  | 6,536 |  |  |  |  | 6,536
Stock option exercises (in shares) | 6,490,059 |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  | 5,061 |  |  |  |  | 5,061
Conversion of convertible preferred stock to common stock upon initial public offering | $ 7 |  |  | 106,230 |  |  |  |  | 106,237
Conversion of convertible preferred stock to common stock upon initial public offering (in shares) | 65,428,088 |  |  |  |  |  |  |  |
Conversion of convertible preferred stock warrants to common stock warrants upon initial public offering |  |  |  | 22,765 |  |  |  |  | 22,765
Warrant exercise |  |  |  | 62 |  |  |  |  | 62
Warrant exercise (in shares) | 441,307 |  |  |  |  |  |  |  |
Issuance of Common Stock in connection with initial public offering, net of issuance costs of $5.9 million and $3.7 million in offering costs |  |  |  | 77,479 |  |  |  |  | 77,479
Net income |  |  |  |  |  | (8,569) |  |  | (8,569)
Balance at end of period at Dec. 31, 2019 | $ 8 | (1,009) |  | 228,755 | $ (1,169) | (113,483) |  | $ (1,169) | $ 114,271
Balance at end of period (in shares) at Dec. 31, 2019 | 84,188,202 |  |  |  |  |  |  |  | 84,188,202
Increase (Decrease) in Stockholders’ Equity |  |  |  |  |  |  |  |  |
Issuance of employee equity awards, net of shares withheld | $ 1 |  |  | (5,451) |  |  |  |  | $ (5,450)
Issuance of employee equity awards, net of shares withheld (in shares) | 2,688,273 |  |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  |  |  |  |  |  |  | 2,979,700
Stock-based compensation |  |  |  | (12,821) |  |  |  |  | $ (12,821)
Reduction in initial public offering costs |  |  |  | (14) |  |  |  |  | (14)
Warrant exercise |  |  |  | 0 |  |  |  |  | 0
Warrant exercise (in shares) | 177,854 |  |  |  |  |  |  |  |
Other comprehensive income |  |  |  |  |  |  | $ 1 |  | 1
Net income |  |  |  |  |  | 46,459 |  |  | 46,459
Balance at end of period at Dec. 31, 2020 | $ 9 | $ (1,009) |  | $ 236,139 |  | $ (68,193) | $ 1 |  | $ 166,947
Balance at end of period (in shares) at Dec. 31, 2020 | 87,054,329 |  |  |  |  |  |  |  | 87,054,329

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