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Income Tax Components of deferred tax assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Document Fiscal Year Focus 2013  
Deferred tax assets:    
Compensation and benefits $ 10,883 $ 14,101
Net operating loss carryforward 18,453 12,710
Inventory reserve 2,734 3,654
Accounts receivable reserve 353 657
Other 4,113 4,694
Total deferred tax assets 36,536 35,816
Deferred tax liabilities:    
Property, plant and equipment 53 738
Other 590 728
Total deferred liabilities 643 1,466
Net deferred assets before valuation allowance 35,893 34,350
Valuation allowance (35,834) (34,278)
Net deferred assets 59 72
Net deferred tax assets:    
Net current deferred tax assets 5 17
Net noncurrent deferred tax assets 54 55
Net deferred assets $ 59 $ 72