Other Related Party Transactions - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	May. 04, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Related Party Transaction [Line Items]
Options, grant date price				$ 4.80
Executive Vice President [Member]
Related Party Transaction [Line Items]
Fees for consulting work performed		$ 66,000	$ 67,000	$ 197,000	$ 197,000
Payment of annual bonus compensation				$ 77,500	$ 47,500
Options, grant date price	$ 4.78
Options, number granted	225,000
Options, weighted average fair market value	$ 1.80
Options, vesting period	3 years