Anti-dilutive Security not Included In Diluted per Share Calculations (Detail) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive securities	5,800,201	6,053,589
Options To Purchase Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive securities	2,317,401	2,200,890
Common Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive securities	180,954	180,954
Redeemable Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti dilutive securities	3,301,846	3,671,745