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Other Financial Statement Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Allowance for doubtful receivables
Balance at beginning of year	$ 49	$ 50
Provision for doubtful receivables	15
Write-offs		(1)
Balance at end of year	$ 64	$ 49

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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