Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Details)

v3.20.1
Fair Value Measurements - Additional Information (Details) - Level 3
Mar. 31, 2020
Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Warrant liabilities, maturity date Jun. 12, 2023  
Stock Price Volatility    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative liabilities, unobservable inputs rate 56.8  
Stock Price Volatility | Minimum    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Warrant liabilities, stock price volatility rate 73.7  
Stock Price Volatility | Maximum    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Warrant liabilities, stock price volatility rate 78.4  
Stock Price Volatility | Weighted Average    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Warrant liabilities, stock price volatility rate 75.0  
Weighted Average Expected Term    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Warrant liabilities, expected term 2 years 7 months 6 days  
Weighted Average Expected Term | Minimum    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Warrant liabilities, expected term   1 year 7 months 6 days
Weighted Average Expected Term | Maximum    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Warrant liabilities, expected term   3 years 2 months 12 days
Market Credit Spread    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative liabilities, unobservable inputs rate 2,063  
Estimated Yield    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Derivative liabilities, unobservable inputs rate 21.0  
Discounts for Lack of Marketability    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Senior convertible notes, unobservable inputs rate 12.07