Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Income tax (expense) benefit	$ (138,000)	$ 2,440,000	$ (374,000)	$ 2,252,000
Pre-tax loss	11,909,000	$ 9,231,000	21,333,000	17,348,000
Decrease in valuation allowances				$ 2,603,000
Income tax benefit recognized with respect to losses incurred			0
Income tax expense with respect to earnings	0		0
Uncertain tax benefits gross	1,581,000		1,581,000
Interest and penalties related to unrecognized tax benefits	$ 0		$ 0