Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ (37,000)	$ 300,000	$ 611,000	$ 674,000
Pre-tax loss	3,090,000	9,204,000	11,273,000	30,537,000
Income tax benefit recognized with respect to losses incurred			0
Income tax expense with respect to earnings	0		0
Increase or decrease in unrecognized tax benefits			0
Interest or penalties associated with uncertain tax positions	$ 0	$ 0	$ 0	$ 0