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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 30, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Subsequent Event [Line Items] |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | $ 6,996 | $ 8,363
Common stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,282,904 | 577,195
Stock Issued During Period, Value, New Issues |  |  | $ 1 | $ 1
ATM | Common stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 1,282,904 |
Shares Issued, Price Per Share |  |  | $ 5.81 |
Stock Issued During Period, Value, New Issues |  |  | $ 7,500 |
Proceeds from Issuance of Common Stock |  |  | $ 7,000 |
ATM | Subsequent Events |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 173,572 |  |
Shares Issued, Price Per Share |  | $ 6.29 |  |
Stock Issued During Period, Value, New Issues |  | $ 1,100 |  |
January 2020 Financing | Oppenheimer & Co. Inc | Common stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Shares Issued, Price Per Share | $ 5.00 |  |  |
Stock Issued During Period, Value, New Issues | $ 26,500 |  |  |
January 2020 Financing | Subsequent Events | Oppenheimer & Co. Inc | Common stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 5,290,000 |  |  |
Proceeds from Issuance of Common Stock | $ 24,500 |  |  |
Over-Allotment option for underwriters | Subsequent Events | Oppenheimer & Co. Inc | Common stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 690,000 |  |  |

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