Inventories (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
Inventory, Net [Abstract]
Raw materials	$ 9,954,000			$ 9,954,000			$ 10,420,000
Work-in-process	1,132,000			1,132,000			605,000
Finished goods	8,505,000			8,505,000			11,245,000
Inventory, Gross	19,591,000			19,591,000			22,270,000
Less: inventory valuation allowance	(2,253,000)			(2,253,000)			(2,199,000)
Inventories, net	17,338,000			17,338,000			20,071,000
Other Inventory, Net [Abstract]
Inventory deposit (A)	10,896,000	[1]		10,896,000	[1]		11,637,000	[1]
Less: inventory deposit valuation allowance	(3,174,000)			(3,174,000)			(2,801,000)
Inventory Deposit, Net	7,722,000			7,722,000			8,836,000
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross	600,000			600,000			700,000
Inventory, net	260,000		578,000	657,000		1,031,000
Inventory Deposit, net	169,000		64,000	810,000		363,000
Adverse Purchase Commitments	$ 164,000		$ (102,000)	$ 132,000		$ (28,000)

[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.