Balance Sheet Information (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Accrued Liabilities [Abstract]
Inventory receipts	$ 1,183	$ 1,457
Paid time off	1,052	940
Payroll, bonuses, and other employee benefits	454	3,015
Warranties	277	249
Employee stock purchase plan	256	232
Professional fees	218	197
Real estate taxes	154	159
Deferred revenues	116	78
Due to Sparco shareholders	3	198
Other	487	567
Total	$ 4,200	$ 7,092