Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2012
|
---|---|
Assets: | |
Fair value measurement disclosure | $ 22,709 |
U.S. Treasury bills and money market funds
|
|
Assets: | |
Fair value measurement disclosure | 22,051 |
Restricted cash
|
|
Assets: | |
Fair value measurement disclosure | 658 |
Fair Value, Inputs, Level 1
|
|
Assets: | |
Fair value measurement disclosure | 22,709 |
Fair Value, Inputs, Level 1 | U.S. Treasury bills and money market funds
|
|
Assets: | |
Fair value measurement disclosure | 22,051 |
Fair Value, Inputs, Level 1 | Restricted cash
|
|
Assets: | |
Fair value measurement disclosure | $ 658 |