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Stockholders' Equity - Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2020
Feb. 29, 2020
Aug. 31, 2019
Jan. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Nov. 02, 2018
Sale of stock              
Proceeds from issuance of common stock in private placement, net of offering costs           $ 7,810  
Commission percentage       3.00%      
2018 Shelf Registration Statement              
Sale of stock              
Aggregate amount of securities issuable             $ 100,000
Private Placement | Common Stock              
Sale of stock              
Issuance of common stock (in shares) 8,426,750       17,250,000 8,426,750  
Share price (in dollars per share) $ 0.93       $ 0.93    
Proceeds from issuance of common stock in private placement, net of offering costs $ 7,800            
At-the-market sales              
Sale of stock              
Proceeds from sales or issuance of common stock, net of offering costs           $ 860  
At-the-market sales | Common Stock              
Sale of stock              
Issuance of common stock (in shares)           665,974  
Public offering              
Sale of stock              
Proceeds from sales or issuance of common stock, net of offering costs         $ 48,434    
Public offering | Common Stock              
Sale of stock              
Issuance of common stock (in shares)   17,250,000 14,526,315        
Share price (in dollars per share)   $ 3.00 $ 0.95        
Proceeds from sales or issuance of common stock, net of offering costs   $ 48,400 $ 12,700        
At The Market Offering              
Sale of stock              
Issuance of common stock (in shares)           665,974  
Gross Proceeds       $ 10,000      
Proceeds from sales or issuance of common stock, net of offering costs           $ 860