Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Operating Loss Carryforwards	$ 77,600,000
Equity Method Investment, Ownership Percentage	50.00%
Operating Loss Carryforward, Expiration Date	2033
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	450,000
Tax Credit Carryforward, Amount	960,000
Operating Loss Carryforward, Expiration Date	2033
Additional Paid-In Capital [Member]
Operating Loss Carryforwards	77,600,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	2,500,000
Research Tax Credit Carryforward [Member]
Tax Credit Carryforward, Amount	$ 1,600,000