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Private Placement (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 09, 2019 | Mar. 28, 2019 | Aug. 06, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares issued (in shares) |  |  | 12,062,000 |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.001 | $ 0.001 |  | $ 0.001
Number of additional shares from warrants (in shares) |  | 2,500,000 | 4,221,700 |  |  |
Gross proceeds |  |  | $ 19,700 |  |  |
Stock issuance costs |  |  | $ 500 |  |  |
Initial exercise price of warrants (in dollars per share) |  | $ 7.00 | $ 2.52 |  |  |
Proceeds from the exercise of warrant to purchase common stock |  | $ 10,600 |  | $ 10,639 | $ 0 |
Preferred stock issued during the period |  |  |  | $ 10,000 | $ 0 |
Series E Preferred Stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock issued (in shares) | 10,000 |  |  | 10,000 |  | 0
Preferred stock issued during the period | $ 10,000 |  |  |  |  |
Dividend rate | 9.00% |  |  |  |  |
Redemption price, percent | 110.00% |  |  |  |  |
Base amount (in dollars per share) | $ 1,000 |  |  | $ 1,000 |  | $ 0

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