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Common stock (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Restricted Common Stock Activity
The following is a summary of restricted common stock activity:
 
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value
Unvested at December 31, 2018
2,084

 
$
11.05

Issued
—

 
—

Vested
(1,250
)
 
11.05

Forfeited
—

 
—

Unvested at June 30, 2019
834

 
$
11.05