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Certain Balance Sheet Accounts (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Allowance for Doubtful Accounts
Balance, beginning of year	$ 326	$ 407	$ 406
Provision for doubtful accounts	708	233	212
Write-offs	(630)	(314)	(211)
Balance, end of year	$ 404	$ 326	$ 407

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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