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Stockholders' Equity (Deficit) Common Stock - 2012 Stock Incentive plan - Additional Information (Detail) - 2012 Stock Incentive Plan [Member] - shares
12 Months Ended
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
May. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock incentive plan description The exercise prices, vesting and other restrictions are determined at the discretion of the board of directors, or their committee if so delegated, except that the exercise price per share of stock options may not be less than 100% of the fair market value of the share of common stock on the date of grant and the term of stock option may not be greater than ten years. The Company generally grants stock-based awards with service conditions only (“service-based” awards).        
Shares available for future grant 120,250        
Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares of common stock that may be issued   4,309,653 3,608,029 3,561,836 1,261,836
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercise price per share of common stock expressed as a percentage 100.00%        
Stock option granted vesting period 4 years        
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option term 10 years        
Stock option granted vesting period 4 years        
Stock option expiration period 10 years