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Stockholders' Equity - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Jun. 11, 2020 | Jan. 15, 2020 | Dec. 31, 2019 | Mar. 29, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Conversion of notes to preferred stock (in shares) | [1] |  | 22,000 |  |  |  |  |  |
Preferred stock, authorized (in shares) |  |  |  |  | 5,000,000 |  | 5,000,000 | 2,000,000 | 2,000,000
Common stock, par value (in usd per share) |  |  |  |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |
Conversion of notes to preferred stock |  |  |  | $ 1,769 |  |  |  |  |
Votes equal to the number of shares of common stock convertible |  |  |  |  | 11.07% |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Conversion of notes to preferred stock (in shares) |  |  | 111,548 | 2,709,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Conversion of notes to preferred stock (in shares) |  |  | 22,310 |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued from conversion (in shares) |  | 2,709,018 |  |  |  |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, authorized (in shares) |  |  |  |  | 3,300,000 |  | 3,300,000 | 0 |
Convertible Debt |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Amount converted |  | $ 1,800 |  |  |  |  |  |  |
Conversion rate (in dollars per share) |  | $ 0.67 |  |  |  |  |  |  |
Common stock, par value (in usd per share) |  | $ 0.0001 |  |  |  |  |  |  |
[1] | * Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.

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