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Common Stock - Schedule of Reserved Shares of Common Stock for Future Issuance (Detail)
Mar. 31, 2014
Dec. 31, 2013
Equity [Abstract]    
For conversion of Series A Preferred, Series B Preferred, Series C Preferred, Series C-2 Preferred, Series D-1 Preferred, and Series D-2 Preferred and exercise of warrants to purchase Series C-1 Preferred and subsequent conversion of the shares purchased 1,705,917 1,675,812
Outstanding stock options 184,240 137,610
Outstanding common stock warrants 276,304 257,242
For possible future issuance under stock option plan 2,687 49,734
Total common shares reserved for future issuance 2,169,148 2,120,398