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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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