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Preferred Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2017 | Oct. 24, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |
Shares authorized (in shares) (up to) |  | 7,500 |  | 7,500
Shares issued (in shares) |  | 32 |  | 32
Shares outstanding (in shares) |  | 32 |  | 32
Stated value (in dollars per share) |  | $ 0.0001 |  | $ 0.0001
Accrued dividends |  | $ 56 |  | $ 47
Conversion price below this fair value of the common stock (in dollars per share) |  | $ 1.16 |  |
Series B-1 Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares authorized (in shares) (up to) |  | 100 |  |
Shares issued (in shares) |  | 0 |  |
Shares outstanding (in shares) |  | 0 |  |
Series B-1 Preferred Stock | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares authorized (in shares) (up to) |  |  | 2,800 |
Shares issued (in shares) |  |  | 2,800 |
Stated value (in dollars per share) |  |  | $ 1,000 |
Conversion of preferred stock (in dollars per share) |  |  | $ 0.28 |
Series A-2 Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares authorized (in shares) (up to) |  | 7,500 |  |
Shares issued (in shares) |  | 32 |  |
Shares outstanding (in shares) |  | 32 |  |
Stated value (in dollars per share) |  | $ 7,500 |  |
Conversion of preferred stock (in dollars per share) |  | $ 2.9835 |  |
Convertible preferred stock, shares issued upon conversion (in shares) |  | 2,514 |  |
Conversion of preferred stock adjustment (in dollars per share) |  | $ 0 |  |
Cumulative dividend percentage rate, per annum |  | 5.00% |  |
Accrued dividends |  | $ 56 |  |
Redemption price per share (in dollars per share) |  | $ 8,250 |  |
Redemption price per share, value applied to multiplier (in dollars per share) |  | $ 7,500 |  |
Redemption price per share, multiplier, percentage |  | 110.00% |  |
Series A-2 Preferred Stock | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Conversion of preferred stock adjustment (in dollars per share) | $ 2.40 |  |  |
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares authorized (in shares) (up to) |  | 4,000 |  |
Shares issued (in shares) |  | 0 |  |
Shares outstanding (in shares) |  | 0 |  |
Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares authorized (in shares) (up to) |  | 5,000,000 |  |

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