Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Accrued Liabilities, Current [Abstract]
Advance payments from customers	$ 3,778	$ 4,971
Accrued Group Purchasing Organization (GPO) fees	2,558	2,324
technologylicensepurchaseobigationcurrent	1,000	1,500
Rebates and lease buyouts	2,036	1,699
Taxes payable	2,406	1,664
Other	1,716	1,588
Total	$ 13,494	$ 13,746