Components Accounts Payable and Accrued Liabilities in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Accounts Payable And Accrued Liabilities [Line Items]
Accounts payable — trade	$ 3,233	$ 6,460
Accrued legal-related fees	2,654	2,999
Deferred revenue		1,000
Accrued employee compensation	834	818
Other accrued liabilities	1,474	1,753
Total accounts payable and accrued liabilities	$ 8,195	$ 13,030