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Summary of Significant Accounting Policies - Changes in Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Changes in the allowance for doubtful accounts
Balance at beginning of period	$ 0
Additions: Charged to operations	570
Additions: Charged to Deferred Revenue	172
Less: Write-offs	0
Balance at end of period	$ 742

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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