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 |