Components Accounts Payable and Accrued Liabilities in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accounts Payable And Accrued Liabilities [Line Items]
Accounts payable — trade	$ 2,572	$ 6,460
Accrued legal-related fees	3,371	2,999
Deferred revenue	1,000	1,000
Accrued employee compensation	992	818
Other accrued liabilities	1,924	1,753
Total accounts payable and accrued liabilities	$ 9,859	$ 13,030