Stockholders' Equity - Summary of Warrants Outstanding (Detail)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number Outstanding	25,970
Warrant One [Member]
Class Of Warrant Or Right [Line Items]
Number Outstanding	9,051
Exercise price of warrant issued | $ / shares	$ 6.63
Expiration Date	2017-09
Warrant Two [Member]
Class Of Warrant Or Right [Line Items]
Number Outstanding	2,006
Exercise price of warrant issued | $ / shares	$ 7.48
Expiration Date	2021-03
Warrant Three [Member]
Class Of Warrant Or Right [Line Items]
Number Outstanding	14,913
Exercise price of warrant issued | $ / shares	$ 20.12
Expiration Date	2023-07