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Related Party Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 05, 2019 | Dec. 31, 2019
Related Party Transactions |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) | 7,557,142 |
Price per share (in dollars per share) | $ 1.75 |
Number of warrants issued per common stock | 1 |
Issuance of common stock (value) | $ 12,122 | $ 12,122
Underwriters' exercise |  |
Related Party Transactions |  |
Issuance of Series A & B Convertible Preferred Stock, net of underwriting discounts (in shares) | 985,714 |
2019 Warrants |  |
Related Party Transactions |  |
Exercise price (per warrant) | $ 1.95 |
Warrant expiring period | 7 years |

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