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Convertible Preferred Stock - Summary of Convertible Preferred Stock (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 | Oct. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 43,921 |  | $ 43,921 |
Exchange, including deemed dividend | 5,326 |  |  |
Ending balance |  |  |  | $ 43,921
Series A Preferred |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 12,575 |  | $ 12,575 |
Beginning balance, Shares | 3,146,551 |  | 3,146,551 |
Issuance |  | $ 12,744 |  | $ 12,744
Issuance, shares |  |  |  | 3,146,551
Issuance costs |  |  |  | $ (169)
Conversion to common stock |  |  | $ (12,575) |
Conversion to common stock, shares |  |  | (3,146,551) |
Ending balance |  |  |  | $ 12,575
Ending balance, Shares |  |  |  | 3,146,551
Series A-1 Preferred |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 24,994 |  | $ 24,994 |
Beginning balance, Shares | 7,372,719 |  | 7,372,719 |
Issuance on conversion of convertible notes |  |  |  | $ 9,558
Issuance on conversion of convertible notes, shares |  |  |  | 2,819,267
Issuance on milestone closing of convertible notes |  |  |  | $ 15,436
Issuance on milestone closing of convertible notes, shares |  |  |  | 4,553,452
Conversion to common stock |  |  | $ (24,994) |
Conversion to common stock, shares |  |  | (7,372,719) |
Ending balance |  |  |  | $ 24,994
Ending balance, Shares |  |  |  | 7,372,719
Series A-2 Preferred |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 6,352 |  | $ 6,352 |
Beginning balance, Shares | 1,873,777 |  | 1,873,777 |
Issuance on conversion of convertible notes |  |  |  | $ 6,352
Issuance on conversion of convertible notes, shares |  |  |  | 1,873,777
Exchange, including deemed dividend | $ 4,764 |  | $ (4,764) |
Exchange, including deemed dividend, Shares | (1,405,332) |  | (1,405,332) |
Conversion to common stock |  |  | $ (1,588) |
Conversion to common stock, shares |  |  | (468,445) |
Ending balance |  |  |  | $ 6,352
Ending balance, Shares |  |  |  | 1,873,777
Series B Preferred Stock |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Issuance |  |  | $ 50,000 |
Issuance, shares | 6,963,788 |  | 6,963,788 |
Exchange, including deemed dividend | $ 10,090 |  | $ 10,090 |
Exchange, including deemed dividend, Shares | 1,405,332 |  | 1,405,332 |
Issuance costs |  |  | $ (1,293) |
Conversion to common stock |  |  | $ (58,797) |
Conversion to common stock, shares |  |  | (8,369,120) |
Convertible Preferred Stock |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Beginning balance | $ 43,921 |  | $ 43,921 |
Beginning balance, Shares | 12,393,047 |  | 12,393,047 |
Issuance on conversion of convertible notes |  |  |  | $ 15,910
Issuance on conversion of convertible notes, shares |  |  |  | 4,693,044
Issuance on milestone closing of convertible notes |  |  |  | $ 15,436
Issuance on milestone closing of convertible notes, shares |  |  |  | 4,553,452
Issuance |  |  | $ 48,707 | $ 12,575
Exchange, including deemed dividend |  |  | 5,326 |
Issuance costs |  |  | (1,293) | (169)
Conversion to common stock |  |  | $ (97,954) |
Conversion to common stock, shares |  |  | (19,356,835) |
Ending balance |  |  |  | $ 43,921
Ending balance, Shares |  |  | 0 | 12,393,047

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