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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock. | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Accumulated Deficit | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 | $ 3 | $ 280,840 | $ (34) | $ (170,473) | $ 110,336
Balance (in shares) at Dec. 31, 2018 | 29,323,930 |  |  |  |
Increase (Decrease) in Stockholders' Deficit |  |  |  |  |
Common stock issued on exercise of stock options |  | 1 |  |  | 1
Common stock issued on exercise of stock options (in shares) | 2,970 |  |  |  |
Vesting of restricted stocks issued upon early exercise of stock options |  | 5 |  |  | 5
Stock-based compensation expense |  | 1,953 |  |  | 1,953
Unrealized gain on marketable securities |  |  | 45 |  | 45
Net loss |  |  |  | (11,643) | (11,643)
Balance at Mar. 31, 2019 | $ 3 | 282,799 | 11 | (182,116) | 100,697
Balance (in shares) at Mar. 31, 2019 | 29,326,900 |  |  |  |
Balance at Dec. 31, 2018 | $ 3 | 280,840 | (34) | (170,473) | 110,336
Balance (in shares) at Dec. 31, 2018 | 29,323,930 |  |  |  |
Increase (Decrease) in Stockholders' Deficit |  |  |  |  |
Net loss |  |  |  |  | (24,621)
Balance at Jun. 30, 2019 | $ 3 | 284,706 | 39 | (195,094) | 89,654
Balance (in shares) at Jun. 30, 2019 | 29,348,400 |  |  |  |
Balance at Mar. 31, 2019 | $ 3 | 282,799 | 11 | (182,116) | 100,697
Balance (in shares) at Mar. 31, 2019 | 29,326,900 |  |  |  |
Increase (Decrease) in Stockholders' Deficit |  |  |  |  |
Common stock issued on exercise of stock options |  | 5 |  |  | 5
Common stock issued on exercise of stock options (in shares) | 21,500 |  |  |  |
Vesting of restricted stocks issued upon early exercise of stock options |  | 4 |  |  | 4
Stock-based compensation expense |  | 1,898 |  |  | 1,898
Unrealized gain on marketable securities |  |  | 28 |  | 28
Net loss |  |  |  | (12,978) | (12,978)
Balance at Jun. 30, 2019 | $ 3 | 284,706 | 39 | (195,094) | 89,654
Balance (in shares) at Jun. 30, 2019 | 29,348,400 |  |  |  |
Balance at Dec. 31, 2019 | $ 3 | 288,224 | 29 | (217,145) | 71,111
Balance (in shares) at Dec. 31, 2019 | 27,953,233 |  |  |  |
Increase (Decrease) in Stockholders' Deficit |  |  |  |  |
Stock-based compensation expense |  | 1,845 |  |  | 1,845
Unrealized gain on marketable securities |  |  | 14 |  | 14
Net loss |  |  |  | (12,935) | (12,935)
Balance at Mar. 31, 2020 | $ 3 | 290,069 | 43 | (230,080) | 60,035
Balance (in shares) at Mar. 31, 2020 | 27,953,233 |  |  |  |
Balance at Dec. 31, 2019 | $ 3 | 288,224 | 29 | (217,145) | 71,111
Balance (in shares) at Dec. 31, 2019 | 27,953,233 |  |  |  |
Increase (Decrease) in Stockholders' Deficit |  |  |  |  |
Net loss |  |  |  |  | (23,546)
Balance at Jun. 30, 2020 | $ 3 | 291,475 | 53 | (240,691) | 50,840
Balance (in shares) at Jun. 30, 2020 | 28,034,733 |  |  |  |
Balance at Mar. 31, 2020 | $ 3 | 290,069 | 43 | (230,080) | 60,035
Balance (in shares) at Mar. 31, 2020 | 27,953,233 |  |  |  |
Increase (Decrease) in Stockholders' Deficit |  |  |  |  |
Common stock issued on exercise of stock options |  | 23 |  |  | 23
Common stock issued on exercise of stock options (in shares) | 81,500 |  |  |  |
Stock-based compensation expense |  | 1,383 |  |  | 1,383
Unrealized gain on marketable securities |  |  | 10 |  | 10
Net loss |  |  |  | (10,611) | (10,611)
Balance at Jun. 30, 2020 | $ 3 | $ 291,475 | $ 53 | $ (240,691) | $ 50,840
Balance (in shares) at Jun. 30, 2020 | 28,034,733 |  |  |  |

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