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