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Stockholders' Equity - Equity Offerings (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 30, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Sep. 28, 2017
Common Stock            
Equity offerings            
Issuance of common stock, net of issuance costs, shares   3,126,709 3,126,709      
September 2017 At-The-Market | Subsequent Event            
Equity offerings            
Issuance of common stock, net of issuance costs, shares 1,010,033          
Weighted average price per share issued $ 4.65          
Aggregate net proceeds from stock sale $ 4.6          
September 2017 At-The-Market | Common Stock            
Equity offerings            
Issuance of common stock, net of issuance costs, shares   3,126,709        
Weighted average price per share issued   $ 3.16 $ 3.16      
Aggregate net proceeds from stock sale   $ 9.6        
Common stock available for sale under agreement         $ 70.1  
Securities sold during period       0    
September 2017 At-The-Market | Common Stock | Maximum            
Equity offerings            
Common stock available for sale under agreement           $ 100.0