Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Common Stock (Details)

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Stockholders' Equity - Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 26, 2019
May 20, 2019
Feb. 29, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Number of shares issued 2,303,030   2,300,000          
Purchase price (in dollar per share) $ 8.25   $ 32.00          
Common stock, par value           $ 0.001   $ 0.001
Issuance costs paid     $ 4,789 $ 4,789 $ 11   $ 378  
Gross proceeds from issuance of common stock $ 1,577   73,600          
Proceeds from issuance of common stock, net of issuance costs $ 17,423   68,811     $ 68,811 $ 230  
Payments to repurchase shares     $ 9,024     $ 9,024    
Shares repurchased (in shares)     300,000     300,000    
Jefferies Sale Agreement                
Number of shares issued   66,193            
Common stock, par value   $ 0.001            
Issuance costs paid   $ 350            
Gross proceeds from issuance of common stock   737            
Proceeds from issuance of common stock, net of issuance costs   387            
Jefferies Sale Agreement | Maximum                
Proceeds from issuance of common stock, net of issuance costs   $ 20,000