Income Taxes (Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Tax Assets, Gross [Abstract]
Net operating loss and tax credit carry forwards	$ 93,547	$ 88,675
Inventory reserve and uniform capitalization	2,016	1,959
Stock options and warrants	2,330	2,807
In-process research and development	237	241
Allowance for bad debts	232	265
Vacation accrual	386	354
Deferred rent	429	283
Landlord provided leasehold improvements	317	0
Deferred revenue	376	0
Warranty accrual	937	494
Depreciation and amortization	695	1,579
Other accruals and reserves	701	4,252
Acquired intangibles	1,336	1,386
Total deferred tax assets	103,539	102,295
Deferred Tax Liabilities, Gross [Abstract]
State taxes	(3,603)	(3,568)
Cloverleaf intangibles	0	(456)
Other	(205)	0
Total deferred income tax liabilities	(3,808)	(4,024)
Valuation allowance	99,731	98,271
Net deferred tax assets	$ 0	$ 0