Inventories (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Inventory, Net [Abstract]
Raw materials	$ 8,860,000			$ 10,420,000
Work-in-process	440,000			605,000
Finished goods	9,540,000			11,245,000
Inventory, Gross	18,840,000			22,270,000
Less: inventory valuation allowance	(2,379,000)			(2,199,000)
Inventories, net	16,461,000			20,071,000
Other Inventory, Net [Abstract]
Inventory deposit (A)	10,659,000	[1]		11,637,000	[1]
Less: inventory deposit valuation allowance	(3,086,000)			(2,801,000)
Inventory Deposit, Net	7,573,000			8,836,000
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross	1,500,000			700,000
Inventory, net	397,000		453,000
Inventory Deposit, net	641,000		299,000
Adverse Purchase Commitments	$ (32,000)		$ 74,000

[1] The Company is contractually obligated to reimburse its contract manufacturer for the cost of excess inventory that has been purchased as a result of the Company's forecasted demand when there is no alternative use. The Company's inventory deposit represents a cash deposit paid to its contract manufacturer for inventory in excess of near term demand. The deposit is recorded net of adverse purchase commitment liabilities, and therefore the net balance of the deposit represents inventory the Company believes will be utilized. The deposit will be applied against future adverse purchase commitments owed to the Company's contract manufacturers or reduced based on the usage of inventory. See Note 8 - Commitments and Contingencies for additional information regarding the Company's adverse purchase commitment liability.