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Stockholders' Equity - Common Stock Issuances - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 05, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Warrant exercise price |  | $ 10.00 |  |  |  | $ 10.00 |  |
Net proceeds from Public Offering |  |  |  |  |  | $ 19,378 | $ 0 |
Conversion price | $ 10.00 |  |  |  |  |  |  |
Conversion of Preferred stock into common stock |  |  |  |  |  | 1,549,609 |  |
Exercise of pre-funded Series D Warrants (in shares) |  |  |  |  |  | 6,000 |  |
Common stock shares issued |  |  |  |  |  | 72,976 |  |
Remaining Warrants exercise price |  | 10.00 |  |  |  | $ 10.00 |  |
Series F warrants [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase of common stock | 2,224,900 |  |  |  |  |  |  |
Warrant exercise price | $ 10.00 |  |  |  |  |  |  |
Warrants issued to purchase of common stock | 2,224,900 |  |  |  |  |  |  |
Remaining Warrants exercise price | $ 10.00 |  |  |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase of common stock | 377,000 |  |  |  |  |  |  |
Warrants issued to purchase of common stock | 377,000 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Warrants issued to purchase of common stock |  |  |  |  |  | 371,000 |  |
Warrant exercise price |  | $ 0.01 |  |  |  | $ 0.01 |  |
Warrants issued to purchase of common stock |  |  |  |  |  | 371,000 |  |
Net proceeds from Public Offering | $ 22,000 |  |  |  |  |  |  |
Conversion of Preferred stock into common stock |  | 1,549,609 | 2,915 |  |  |  |  |
Exercise of pre-funded Series D Warrants (in shares) |  | 6,000 |  | 5,399 | 5,885 |  |  |
Remaining Warrants exercise price |  | $ 0.01 |  |  |  | $ 0.01 |  |
Common Stock [Member] | IPO [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Shares issued in public offering | 1,823,000 |  |  |  |  |  |  |
2019 Warrants [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Warrant exercise price | $ 10.00 |  |  |  |  |  |  | $ 23.04
Net proceeds from Public Offering | $ 22,000 |  |  |  |  |  |  |
Remaining Warrants exercise price | $ 10.00 |  |  |  |  |  |  | $ 23.04

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