Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Significant Unobservable Inputs (Details)

v3.19.1
Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Significant Unobservable Inputs (Details)
 12 Months Ended
Dec. 31, 2018
$ / shares
Price Per Share Scenario One | Phantom Stock Options  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Exercise price (in dollars per share) $ 4
Risk free rate, minimum (as a percent) 2.44%
Risk free rate, maximum (as a percent) 2.69%
Dividend yield (as a percent) 0.00%
Price Per Share Scenario One | Liability Warrants (Level 3)  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Assumed liquidation company share price (in usd per share) $ 10
Common stock price (in usd per share) $ 2.23
Estimated term (in years) 10 years 8 months 1 day
Expected stock volatility (as a percent) 67.00%
Dividend yield (as a percent) 0.00%
Implied discount for lack of marketability (as a percent) 31.60%
Price Per Share Scenario Two | Phantom Stock Options  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Exercise price (in dollars per share) $ 8
Risk free rate, minimum (as a percent) 2.44%
Risk free rate, maximum (as a percent) 2.69%
Dividend yield (as a percent) 0.00%
Price Per Share Scenario Two | Liability Warrants (Level 3)  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Assumed liquidation company share price (in usd per share) $ 12
Common stock price (in usd per share) $ 2.23
Estimated term (in years) 11 years 11 months 19 days
Expected stock volatility (as a percent) 67.00%
Dividend yield (as a percent) 0.00%
Implied discount for lack of marketability (as a percent) 31.80%
Minimum | Price Per Share Scenario One | Phantom Stock Options  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Common stock price (in usd per share) $ 2.23
Estimated term (in years) 4 years 5 months 23 days
Expected stock volatility (as a percent) 62.00%
Minimum | Price Per Share Scenario Two | Phantom Stock Options  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Estimated term (in years) 6 years 5 months 27 days
Maximum | Price Per Share Scenario One | Phantom Stock Options  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Estimated term (in years) 4 years 11 months 12 days
Maximum | Price Per Share Scenario Two | Phantom Stock Options  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)  
Common stock price (in usd per share) $ 2.23
Estimated term (in years) 6 years 11 months 12 days
Expected stock volatility (as a percent) 62.00%