Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accrued Liabilities, Current [Abstract]
Payroll and related expenses	$ 5,806	$ 5,065
Accrued payables	1,896	2,259
Deferred Rent Credit, Current	349	490
Lease financing, current portion	612	528
Product warranty	846	840
Customer Refund Liability, Current	625	281
Sales and use tax payable	93	259
Other	154	119
Total accrued payroll and other current liabilities	$ 10,381	$ 9,841