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Common stock Common stock (Tables)
 3 Months Ended
Mar. 31, 2015
Equity [Abstract]  
Restricted common stock activity
The following is a summary of restricted common stock activity related to shares sold to the Company's founders:
 
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value
Non-vested at December 31, 2014
3,218,590

 
$
0.10

Vested
(254,088
)
 
0.10

Non-vested at March 31, 2015
2,964,502

 
$
0.10