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Other Financial Statement Information (Details 4) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Accrued liabilities |  |
Compensation | $ 349 | $ 254
Accrued rent | 201 | 208
Sales tax and other | 57 | 65
Total accrued liabilities | $ 607 | $ 527

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