Summary of Balances of Transactions with Related Parties (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Transactions with Third Party [Line Items]
Accounts payable	$ 5,907	[1]	$ 8,886	[1]
Other long-term liabilities	109	[1]	333	[1]
Unvested Stock Options [Member]
Transactions with Third Party [Line Items]
Accounts payable	200		200
Other long-term liabilities	$ 300		$ 300

[1] Includes an account payable of $0.2 million and a long-term liability of $0.3 million for both September 30, 2014 and December 31, 2013, respectively, related to the unvested portion of stock options as a result of the equitable adjustment approved by our Board of Directors on December 18, 2012 that will be payable to executive officers and employees upon vesting of stock options.