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Comprised Balance of Accrued Liabilities and Other (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Payables and Accruals [Abstract]    
Deferred revenue $ 3,955 $ 2,295
Accrued operating expenses 3,633 3,664
Deferred rent obligations 887 986
Other employee related 394 323
Accrued other (includes ESPP contributions of $763 and $1,059 at June 30, 2013 and December 31, 2012, respectively) 4,771 3,135
Total accrued liabilities and other balance 13,640 10,403
ESPP Contributions $ 763 $ 1,059