Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax expense/benefit	$ (79,000)	$ 1,070,000
Statutory rate	34.00%	34.00%
Deferred Tax Assets, Valuation allowances	600,000		600,000
Domestic deferred tax assets ratable reversal pattern period	15 years
Operating loss carry forward, Expiration period	The carry forward rules allow for up to a 20 year carry forward of net operating losses
Net operating loss carry forward period	20 years
Average period required to utilize future income	27 years 6 months
Gross unrecognized tax benefit	1,500,000		1,500,000
Period decrease in unrecognized tax benefits related to research credits	12 months
Decrease in gross unrecognized tax benefit	$ 800,000