Income Taxes (Deferred Tax Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Deferred Tax Assets, Gross [Abstract]    
Net operating loss and tax credit carry forwards $ 93,128 $ 93,547
Inventory reserve and uniform capitalization 1,474 2,016
Stock options and warrants 2,440 2,330
In-process research and development 0 237
Allowance for bad debts 171 232
Vacation accrual 261 386
Deferred rent 143 429
Deferred revenue 380 376
Warranty accrual 958 937
Depreciation and amortization 1,358 1,012
Other accruals and reserves 362 701
Accrued Bonus 873 0
Acquired intangibles 1,195 1,336
Total deferred tax assets 102,743 103,539
Deferred Tax Liabilities, Gross [Abstract]    
State taxes (3,885) (3,603)
Other (548) (205)
Total deferred income tax liabilities (4,433) (3,808)
Valuation allowance (98,205) (99,731)
Net deferred tax assets $ 105 $ 0