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Net loss per share - Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share (Detail) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from the calculation of diluted net loss per share 4,331 4,571
Warrants [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from the calculation of diluted net loss per share 177 338
Outstanding stock options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from the calculation of diluted net loss per share 3,853 4,112
Restricted Common Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from the calculation of diluted net loss per share   27
Restricted Stock Units R S U [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from the calculation of diluted net loss per share 203  
Employee Stock Purchase Plan [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from the calculation of diluted net loss per share 4  
Acquisition holdback [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Common stock equivalents excluded from the calculation of diluted net loss per share 94 94