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Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued liabilities
Accrued payroll and other compensation	$ 2,508	$ 3,687
Excess recovery reserve	966	1,157
Accrued vendor charges	530	594
Other	1,278	1,044
Total accrued liabilities	$ 5,282	$ 6,482

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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