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Statements of Stockholders' Equity (Deficit) - 12 months ended Dec. 31, 2019 - USD ($) $ in Thousands | Total | IPO | Follow-on Offering | Preferred Stock Series A Preferred Stock | Common Stock | Common Stock IPO | Common Stock Follow-on Offering | Additional Paid In Capital | Additional Paid In Capital IPO | Additional Paid In Capital Follow-on Offering | Accumulated Other Comprehensive Gain | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  |  |  | 0 | 27,274,991 |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 84,384 |  |  | $ 0 | $ 1 |  |  | $ 207,408 |  |  | $ 0 | $ (123,025)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  | 5,999,550 | 288,124 |  |  |  |  |
Issuance of common stock |  | $ 73,022 | $ 2,455 |  |  |  |  |  | $ 73,022 | $ 2,455 |  |
Stock-based compensation | 9,624 |  |  |  |  |  |  | 9,624 |  |  |  |
Net loss | (90,034) |  |  |  |  |  |  |  |  |  |  | (90,034)
Other comprehensive gain | 6 |  |  |  |  |  |  |  |  |  | 6 |
Ending balance (in shares) at Dec. 31, 2019 |  |  |  | 0 | 33,562,665 |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 79,457 |  |  | $ 0 | $ 1 |  |  | $ 292,509 |  |  | $ 6 | $ (213,059)

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