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Organization and Significant Accounting Policies - Fair Value Measurement and Unobservable Rollforward Activity of Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Beginning balance    $ 38
Issuances      
Adjustments to estimated fair value due to expiry   (38)
Ending balance