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Common stock (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2017
5,334

 
$
10.51

Issued
—

 
—

Vested
(2,625
)
 
9.95

Forfeited
—

 
—

Unvested at September 30, 2018
2,709

 
$
11.05

The following is a summary of restricted common stock activity:
 
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value
Unvested at December 31, 2017
169,654

 
$
0.10

Issued
—

 
—

Vested
(169,654
)
 
0.10

Forfeited
—

 
—

Unvested at September 30, 2018
—

 
$
—