Warrant Derivative Liabilities - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2010
Line of Credit Facility [Line Items]
Warrants outstanding	2,513,000
Loan facility amount	$ 60
Fair value of warrants per warrant	$ 1.07	$ 3.18
Minimum [Member]
Line of Credit Facility [Line Items]
Direct or indirect owner voting power of the outstanding common stock	50.00%
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Warrants outstanding	1,826,001	1,720,334
Loan facility amount			$ 60