Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v3.20.1
Subsequent Events (Details) - USD ($)
 1 Months Ended 3 Months Ended
Apr. 29, 2020
Apr. 24, 2020
Mar. 31, 2020
Apr. 28, 2020
Mar. 23, 2020
Dec. 31, 2019
May 23, 2019
Subsequent Event [Line Items]              
Number of shares for purchase under warrant (in shares)         9,000,000.0   1,500,000
Common stock purchase price (in dollars per share)         $ 1.00   $ 10.00
Principal outstanding     $ 133,130,000     $ 144,955,000  
At-the-Market Program              
Subsequent Event [Line Items]              
Number of common stock issued (in shares)     142,119        
Net proceeds from sale of stock     $ 100,000        
Sale of stock, remaining availability for sale amount     $ 389,200,000        
Subsequent Event | At-the-Market Program              
Subsequent Event [Line Items]              
Number of common stock issued (in shares)   2,372,716          
Net proceeds from sale of stock   $ 3,300,000          
Sale of stock, commissions and fees   100,000          
Sale of stock, remaining availability for sale amount   $ 385,800,000          
2020 Unsecured Note | Senior note | Subsequent Event              
Subsequent Event [Line Items]              
Principal amount $ 56,000,000.0            
Proceeds from debt, Net of fees 47,300,000            
Debt issuance costs $ 2,700,000            
Number of shares for purchase under warrant (in shares) 20,000,000.0            
Common stock purchase price (in dollars per share) $ 1.542            
Third Amendment of 2019 Term Loan | Senior note | Subsequent Event              
Subsequent Event [Line Items]              
Number of shares for purchase under warrant (in shares)       4,700,000      
Common stock purchase price (in dollars per share)       $ 1.542      
Principal outstanding       $ 15,000,000.0      
Number of common stock to be issued related to debt amendment (in shares)       9,300,000      
Required principal payment       $ 2,200,000      
Required principal payment due within 30 days       $ 400,000