Warrants Liability, at Fair Value - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Oct. 31, 2011	Mar. 31, 2017	Mar. 31, 2016
Class of Warrant or Right [Line Items]
Recognition of warrants fair value at date of issuance		$ 0	$ 0
Number of warrants exercised during the period		0	0
October 28, 2011 Warrants [Member] | Warrants Liability, at Fair Value [Member]
Class of Warrant or Right [Line Items]
Recognition of warrants fair value at date of issuance	$ 1,300,000
Number of warrants exercised during the period		0	0