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Stockholders' Equity - 2019 Stock Offerings (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended
--- | --- | --- | ---
Jan. 06, 2020 | Dec. 23, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Class of Stock [Line Items] |  |  |  |
Proceeds from common stock offering |  |  | $ 2,973 | $ 0
Common Stock Issued December 2019 |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of stock, net (in shares) |  | 10,000,000 |  |
Price per share in sale of stock (in dollars per share) |  | $ 2.75 |  |
Proceeds from common stock offering |  | $ 27,500 |  |
Proceeds from issuance of common stock, net |  | $ 25,344 |  |
Over-Allotment Option |  |  |  |
Class of Stock [Line Items] |  |  |  |
Issuance of stock, net (in shares) | 1,081,184 |  |  |
Proceeds from common stock offering | $ 2,973 |  |  |
Proceeds from issuance of common stock, net | $ 2,766 |  |  |
Additional shares of common stock offered in common stock offering (in shares) |  | 1,500,000 |  |

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