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Stock-based compensation and warrants - Summary of Restricted Common Stock (Detail) (Restricted Common Stock [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Restricted Common Stock [Member]
 
Shares  
Unvested balance at beginning of period 69
Granted 0
Vested (62)
Forfeited 0
Unvested balance at end of period 7
Weighted-average grant date fair value  
Unvested balance at beginning of period $ 0.95
Granted $ 0
Vested $ 0.95
Forfeited $ 0
Unvested balance at end of period $ 0.95