Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ (175,000)	$ 1,194,000	$ 502,000	$ 1,188,000
Uncertain tax provisions	484,000		484,000		304,000
Interest expense	$ 5,000	$ 0		$ 0