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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Equivalents
Cash and cash equivalents held in international locations	$ 14,059	$ 15,762
Accounts Receivable and Concentration of Credit Risk
Reserve for doubtful accounts	0	263
Bad debt provision	$ 0	$ 0	$ 162
Minimum
Equipment & fixtures
Lease term	1 year
Maximum
Equipment & fixtures
Lease term	8 years
Furniture and fixtures
Equipment & fixtures
Estimated useful lives	5 years
Software \| Minimum
Equipment & fixtures
Estimated useful lives	3 years
Software \| Maximum
Equipment & fixtures
Estimated useful lives	5 years
Equipment \| Minimum
Equipment & fixtures
Estimated useful lives	3 years
Equipment \| Maximum
Equipment & fixtures
Estimated useful lives	5 years

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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