Inventories (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Inventory, Net [Abstract]
Raw materials	$ 16,836,000		$ 16,836,000		$ 22,416,000
Work-in-process	665,000		665,000		1,194,000
Finished goods	9,750,000		9,750,000		9,644,000
Inventory, Gross	27,251,000		27,251,000		33,254,000
Less: inventory valuation allowance	(7,475,000)		(7,475,000)		(7,845,000)
Inventories, net	19,776,000		19,776,000		25,409,000
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross, Contract Manufacturing Partner	6,100,000		6,100,000
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross	8,000,000		8,000,000		12,000,000
Inventory Charges, Inventory Valuation, Deposit And Adverse Purchase Commitment Liability	182,000	429,000	1,344,000	1,467,000
Adverse Purchase Commitments	$ 281,000	$ 164,000	$ (154,000)	$ (132,000)