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Related Party Transactions - Summary of Balances of Transactions with Related Parties (Parenthetical) (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Transactions with Third Party [Line Items]    
Accounts payable [1] $ 2,687,000 $ 5,260,000
Other long-term liabilities [1] 14,000 45,000
Unvested Stock Options [Member]    
Transactions with Third Party [Line Items]    
Accounts payable 32,000 200,000
Other long-term liabilities $ 14,000 $ 45,000
[1] Includes an account payable of $32,000 and $0.2 million and a long-term liability of $14,000 and $45,000 for December 31, 2015 and 2014, respectively, related to the unvested portion of stock options as a result of the equitable adjustment approved by the Company's Board of Directors on December 18, 2012 that will be payable to executive officers and employees upon vesting of stock options.