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Common stock (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2015
2,202,262

 
$
0.10

Issued
—

 
—

Vested
(762,228
)
 
0.10

Unvested at September 30, 2016
1,440,034

 
$
0.10

The following is a summary of restricted common stock activity:
 
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value
Unvested at December 31, 2015
—

 
$
—

Issued
18,194

 
9.51

Vested
(5,985
)
 
9.25

Unvested at September 30, 2016
12,209

 
$
9.63