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Condensed Statements of Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Preferred Stock | Common Stock | Additional Paid-In Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Preferred stock, outstanding (shares) at Dec. 31, 2019 |  | 8,249,939 |  |  |
Beginning balance at Dec. 31, 2019 | $ (6,005) | $ 63,402 | $ 2 | $ 27 | $ (6,034)
Beginning balance (shares) at Dec. 31, 2019 |  |  | 2,646,619 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | (1,957) |  |  |  | (1,957)
Recognition of stock-based compensation expense | 4 |  |  | 4 |
Lapse of repurchase rights related to common stock issued pursuant to early exercises (shares) |  |  | 4,300 |  |
Preferred stock, outstanding (shares) at Mar. 31, 2020 |  | 8,249,939 |  |  |
Ending balance at Mar. 31, 2020 | (7,958) | $ 63,402 | $ 2 | 31 | (7,991)
Ending balance (shares) at Mar. 31, 2020 |  |  | 2,650,919 |  |
Preferred stock, outstanding (shares) at Dec. 31, 2019 |  | 8,249,939 |  |  |
Beginning balance at Dec. 31, 2019 | (6,005) | $ 63,402 | $ 2 | 27 | (6,034)
Beginning balance (shares) at Dec. 31, 2019 |  |  | 2,646,619 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | (5,207) |  |  |  |
Shares issued as consideration for in-license rights | 0 |  |  |  |
Preferred stock, outstanding (shares) at Jun. 30, 2020 |  | 8,249,939 |  |  |
Ending balance at Jun. 30, 2020 | (11,035) | $ 63,402 | $ 2 | 204 | (11,241)
Ending balance (shares) at Jun. 30, 2020 |  |  | 2,651,996 |  |
Preferred stock, outstanding (shares) at Mar. 31, 2020 |  | 8,249,939 |  |  |
Beginning balance at Mar. 31, 2020 | (7,958) | $ 63,402 | $ 2 | 31 | (7,991)
Beginning balance (shares) at Mar. 31, 2020 |  |  | 2,650,919 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | (3,250) |  |  |  | (3,250)
Recognition of stock-based compensation expense | 173 |  |  | 173 |
Exercise of vested stock options (shares) |  |  | 1,000 |  |
Preferred stock, outstanding (shares) at Jun. 30, 2020 |  | 8,249,939 |  |  |
Ending balance at Jun. 30, 2020 | $ (11,035) | $ 63,402 | $ 2 | 204 | (11,241)
Ending balance (shares) at Jun. 30, 2020 |  |  | 2,651,996 |  |
Preferred stock, outstanding (shares) at Dec. 31, 2020 | 0 | 0 |  |  |
Beginning balance at Dec. 31, 2020 | $ 165,980 | $ 0 | $ 4 | 198,821 | (32,845)
Beginning balance (shares) at Dec. 31, 2020 | 20,323,301 |  | 20,323,201 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | $ 10,376 |  |  |  | 10,376
Recognition of stock-based compensation expense | 1,363 |  |  | 1,363 |
Exercise of vested stock options (shares) |  |  | 13,773 |  |
Exercise of vested stock options | 19 |  |  | 19 |
Shares issued as consideration for in-license rights (shares) |  |  | 187,500 |  |
Shares issued as consideration for in-license rights | 5,494 |  |  | 5,494 |
Preferred stock, outstanding (shares) at Mar. 31, 2021 |  | 0 |  |  |
Ending balance at Mar. 31, 2021 | $ 183,232 | $ 0 | $ 4 | 205,697 | (22,469)
Ending balance (shares) at Mar. 31, 2021 |  |  | 20,524,474 |  |
Preferred stock, outstanding (shares) at Dec. 31, 2020 | 0 | 0 |  |  |
Beginning balance at Dec. 31, 2020 | $ 165,980 | $ 0 | $ 4 | 198,821 | (32,845)
Beginning balance (shares) at Dec. 31, 2020 | 20,323,301 |  | 20,323,201 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | $ 16,721 |  |  |  |
Shares issued as consideration for in-license rights | $ 5,494 |  |  |  |
Preferred stock, outstanding (shares) at Jun. 30, 2021 | 0 | 0 |  |  |
Ending balance at Jun. 30, 2021 | $ 192,471 | $ 0 | $ 4 | 208,591 | (16,124)
Ending balance (shares) at Jun. 30, 2021 | 20,573,951 |  | 20,573,951 |  |
Preferred stock, outstanding (shares) at Mar. 31, 2021 |  | 0 |  |  |
Beginning balance at Mar. 31, 2021 | $ 183,232 | $ 0 | $ 4 | 205,697 | (22,469)
Beginning balance (shares) at Mar. 31, 2021 |  |  | 20,524,474 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income (loss) | 6,345 |  |  |  | 6,345
Recognition of stock-based compensation expense | 2,794 |  |  | 2,794 |
Exercise of vested stock options (shares) |  |  | 255 |  |
Exercise of vested stock options | 1 |  |  | 1 |
Lapse of repurchase rights related to common stock issued pursuant to early exercises (shares) |  |  | 49,222 |  |
Lapse of repurchase rights related to common stock issued pursuant to early exercises | $ 99 |  |  | 99 |
Preferred stock, outstanding (shares) at Jun. 30, 2021 | 0 | 0 |  |  |
Ending balance at Jun. 30, 2021 | $ 192,471 | $ 0 | $ 4 | $ 208,591 | $ (16,124)
Ending balance (shares) at Jun. 30, 2021 | 20,573,951 |  | 20,573,951 |  |

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