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Nature of the business and basis of presentation (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 24, 2019
USD ($)
$ / shares
shares
Jun. 06, 2019
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Subsidiary, Sale of Stock              
Common stock issued (in shares)     28,555,379   28,555,379   238,986
Authorized common stock (in shares)     150,000,000   150,000,000   75,000,000
Par value common stock (in dollars per share) | $ / shares     $ 0.0001   $ 0.0001   $ 0.0001
Reverse stock split of the common stock   3.07418          
Net loss | $     $ 7,228 $ 8,673 $ 12,590 $ 9,094  
Accumulated deficit | $     99,155   99,155   $ 86,565
Cash and cash equivalents | $     $ 162,654   $ 162,654   $ 75,975
IPO              
Subsidiary, Sale of Stock              
Common stock issued (in shares) 6,612,500            
Public offering price (in dollars per share) | $ / shares $ 16.00            
Proceeds from issuing shares | $ $ 98,394            
Offering costs | $ $ 2,942            
Conversion of convertible preferred stock into common stock 21,056,136            
Authorized common stock (in shares) 150,000,000            
Par value common stock (in dollars per share) | $ / shares $ 0.0001            
Authorized Preferred stock (in shares) 10,000,000            
Par value preferred stock (in dollars per share) | $ / shares $ 0.0001            
Over allotment              
Subsidiary, Sale of Stock              
Proceeds from issuing shares | $ $ 98,394            
Over allotment | Maximum              
Subsidiary, Sale of Stock              
Common stock issued (in shares) 862,500