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Convertible Notes - Other (Details)
Mar. 01, 2019
USD ($)
D
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Dec. 31, 2019
$ / shares
Senior Convertible Notes      
Common stock, par value | $ / shares   $ 0.0001 $ 0.0001
2026 Convertible Notes      
Senior Convertible Notes      
Convertible notes issued | $ $ 37,500,000 $ 37,500,000  
Interest rate (as a percent) 6.00%    
Effective annual interest rate (as a percent)   14.80%  
Common stock, par value | $ / shares $ 0.0001    
Maximum beneficial ownership percent 19.99%    
Conversion rate 153.8462    
Principal amount of debt that is used in conversion calculations | $ $ 1,000    
Initial conversion price | $ / shares $ 6.50    
Debt repurchase price percent 100.00%    
Consecutive trading days | D 20    
Percentage of product of conversion rate and daily VWAP 5.00%    
Percentage of outstanding principal amount 100.00%    
2026 Convertible Notes | On or after March 1, 2022      
Senior Convertible Notes      
Debt repurchase price percent 100.00%    
Consecutive trading days | D 30    
Minimum percentage of common stock for conversion of debt 130.00%    
Consecutive proceeding trading days for conversion of purchase price | $ 20