Patents - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	$ 1,171,000	$ 1,171,000

Amount of amortization expense expected to be recognized in the remainder of the fiscal year following the latest fiscal year ended for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

No definition available.

Name:	us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant