Quarterly report pursuant to Section 13 or 15(d)

Initial Public Offering (Details)

v3.19.2
Initial Public Offering (Details)
$ / shares in Units, $ in Thousands
2 Months Ended 6 Months Ended 12 Months Ended
Mar. 12, 2018
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Number of shares issued | shares   283,452        
Purchase price (in dollar per share) | $ / shares   $ 6.88        
Proceeds from issuance of common stock, net   $ 1,950 $ 230 $ 56,512    
Underwriting discounts and commissions         $ 4,200  
Deferred offering costs     $ 378     $ 461
Common stock, shares authorized (in shares) | shares 50,000,000   50,000,000   50,000,000  
Common stock, par value | $ / shares $ 0.001   $ 0.001   $ 0.001  
Preferred stock, shares authorized (in shares) | shares 10,000,000   10,000,000   10,000,000  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.001   $ 0.001   $ 0.001  
IPO            
Number of shares issued | shares 5,454,545          
Purchase price (in dollar per share) | $ / shares $ 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          
Stock split 237