Annual report pursuant to Section 13 and 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 12 Months Ended
Mar. 12, 2018
Mar. 31, 2018
Oct. 31, 2017
Sep. 30, 2017
Feb. 28, 2018
Dec. 31, 2018
Dec. 31, 2017
Number of shares issued     271,839 155,709 283,452    
Purchase price (in dollar per share)     $ 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
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 expenses $ 1,698