Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Deficit) - Common Stock (Details)

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Stockholders' Equity (Deficit) - Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 20, 2019
Mar. 12, 2018
Jul. 31, 2019
Feb. 28, 2018
Jun. 30, 2019
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Number of shares issued       283,452            
Purchase price (in dollar per share)       $ 6.88            
Common stock, par value   $ 0.001     $ 0.001   $ 0.001   $ 0.001  
Proceeds from issuance of common stock, net       $ 1,950     $ 230 $ 56,512    
Issuance costs paid         $ 11 $ 5,898 378      
Underwriting discounts and commissions                 $ 4,200  
Deferred offering costs         $ 378   $ 378     $ 461
Jefferies                    
Number of shares issued     43,849       21,744      
Common stock, par value $ 0.001                  
Commission on gross sales proceeds (as a percent) 3.00%                  
Proceeds from issuance of common stock, net     $ 467       $ 230      
Issuance costs paid     $ 23       $ 11      
Jefferies | Maximum                    
Proceeds from issuance of common stock, net $ 20,000                  
IPO                    
Number of shares issued   5,454,545                
Purchase price (in dollar per share)   $ 11.00                
Gross proceeds from issuance of common stock   $ 60,000                
Proceeds from issuance of common stock, net   54,102                
Underwriting discounts and commissions   4,200                
Deferred offering costs   $ 1,698