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Shareholders' Deficit - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | May 31, 2018
Class of Warrant or Right [Line Items] |  |  |
Proceeds upon exercise of stock options and warrants | $ 5,034 | $ 6,720 |
Stock issued from exercise of stock options and warrants (in shares) | 513,790 | 763,575 |
Warrants to purchase common stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Shares of common stock right to purchase by warrant (in shares) |  | 57,487 |
Shares issued from exercise of warrants (in shares) |  | 34,509 |
Warrants outstanding | 43,115 |  |
CRG Loan | Warrants to purchase common stock |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrant exercise price (in USD per share) |  |  | $ 23.00
Fair value |  |  | $ 1,400
Warrants and Rights Outstanding, Term |  |  | 5 years
CRG Loan | Warrants to purchase common stock | Maximum |  |  |
Class of Warrant or Right [Line Items] |  |  |
Shares of common stock right to purchase by warrant (in shares) |  |  | 200,000

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