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Comprised Balance of Accrued Liabilities and Other (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Deferred revenue	$ 4,519	$ 2,295
Accrued operating expenses	3,128	3,664
Deferred rent obligations	861	986
Other employee related	482	323
Accrued other (includes ESPP contributions of $330 and $1,059 at September 30, 2013 and December 31, 2012, respectively)	3,942	3,135
Total accrued liabilities and other balance	12,932	10,403
ESPP Contributions	$ 330	$ 1,059

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.

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