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Common stock (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2016
10,834

 
$
9.72

Issued
—

 
—

Vested
(1,375
)
 
8.95

Forfeited
—

 
—

Unvested at March 31, 2017
9,459

 
$
9.83

The following is a summary of restricted common stock activity:
 
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value
Unvested at December 31, 2016
1,185,958

 
$
0.10

Issued
—

 
—

Vested
(254,076
)
 
0.10

Forfeited
—

 
—

Unvested at March 31, 2017
931,882

 
$
0.10