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Financial Instruments - Narrative (Details) |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 02, 2016 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Class of Warrant or Right [Line Items] |  |  |
Value of common stock issued, exercise of warrants |  | $ 0 |
Fair value of warrant |  | 6,433,427 | $ 12,380,939
Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Value of common stock issued, exercise of warrants | $ 4,000,000 |  |
Exercise price of warrants to purchase common stock | $ / shares | $ 2.29 |  |
Exercisable period for warrants (in years) | 10 years |  |
Fair value of warrant |  | $ 6,400,000 |
Warrants, measurement input |  | 0.02 |
Warrants, term |  | 6 years 11 months 1 day |
Subscription Right |  |  |
Class of Warrant or Right [Line Items] |  |  |
Exercise price of warrants to purchase common stock | $ / shares | $ 1.50 |  |
Dividend Yield | Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants, measurement input |  | 0 |
Volatility | Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants, measurement input |  | 0.60 |
Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants outstanding | shares | 2,700,000 |  |
Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants outstanding | shares |  | 1,500,000.0 |
Fair value of warrant | $ 5,800,000 | $ 6,400,000 |

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