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Stockholders' Deficit - Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares) | 26,659 | 589,320 |  |  |  |  |
Purchase price (in dollars per share) | $ 6.91 | $ 2.04 |  |  |  |  |
Repurchase of common stock |  | $ 1,200 | $ 182 | $ 1,205 | $ 182 | $ 1,205 |
Share price (in dollars per share) |  | $ 1.49 |  | $ 1.49 |  | $ 1.49 |
Treasury stock (in shares) |  |  | 615,980 |  | 615,980 |  | 589,320
Accumulated Deficit |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock |  | $ 321 | $ 58 | $ 321 | $ 58 | $ 321 |
Treasury Stock |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common stock |  | $ 884,000 | $ 124 | $ 884 | $ 124 | $ 884 |

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