Annual report pursuant to Section 13 and 15(d)

Initial Public Offering (Details)

v3.19.1
Initial Public Offering (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Mar. 12, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Oct. 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Number of shares issued | shares     271,839 155,709 283,452    
Purchase price (in dollar per share) | $ / shares     $ 4.82 $ 4.82 $ 6.88    
Proceeds from issuance of common stock, net     $ 1,310 $ 751 $ 1,950 $ 56,513 $ 2,061
Underwriting discounts and commissions   $ 4,200          
Deferred offering expenses             $ 461
Common stock, shares authorized (in shares) | shares 50,000,000         50,000,000 50,000,000
Common shares, par value (in dollars per share) | $ / 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 expenses $ 1,698            
Stock split 237