Inventories (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Inventory, Net [Abstract]
Raw materials	$ 9,219,000		$ 21,127,000
Work-in-process	1,195,000		1,194,000
Finished goods	10,762,000		9,644,000
Inventory, Gross	21,176,000		31,965,000
Less: inventory valuation allowance	(2,701,000)		(7,037,000)		(2,199,000)
Inventories, net	18,475,000		24,928,000
Other Inventory, Net [Abstract]
Inventory deposit (A)	370,000	[1]	1,289,000	[1]
Less: inventory deposit valuation allowance	(370,000)		(808,000)
Inventory deposit, net	0		481,000
Inventory Deposit under Consignment	10,300,000
Other Inventory, Materials, Supplies and Merchandise under Consignment, Gross	2,600,000		12,000,000
Inventory, net	2,412,000		3,302,000		1,080,000
Inventory deposit, net	126,000		945,000		926,000
Adverse purchase commitments	323,000		327,000		31,000
Inventory Valuation Allowance [Roll Forward]
Inventory valuation allowance, beginning of the year	7,037,000		2,199,000
Inventory scrapped	(5,768,000)		(956,000)
Inventory utilized	(1,005,000)		(363,000)
Subtotal—usage	(6,773,000)		(1,319,000)
Inventory, net	2,539,000		3,302,000		1,232,000
Transfer from (to) inventory deposit valuation allowance	33,000		2,457,000
Inventory valuation allowance, end of the year	2,701,000		7,037,000		2,199,000
Write-Downs of Inventory Valuation [Member]
Inventory Valuation Allowance [Roll Forward]
Inventory, net	3,417,000		3,665,000
Transfers to Adverse Purchase Commitments [Member]
Inventory Valuation Allowance [Roll Forward]
Inventory, net	$ (1,013,000)	[2]	$ 35,000	[2]

[1] (A)During 2013 the Company modified the inventory deposit arrangement with its former contract manufacturing partner. Prior to the modification, the Company was obligated to place a deposit with its former contract manufacturer for the cost of excess inventory that had been purchased as a result of the Company's forecasted demand when there was no alternative use. Under the new arrangement, rather than place a deposit with the former contract manufacturer, the Company was obligated to purchase the inventory on consignment. The calculation of excess inventory and its impact on the Company’s cash and reported aggregate inventory levels is the same under the consignment arrangement as it was under the deposit arrangement. In the third quarter of 2014, the Company substantially completed the transition to a new contract manufacturing partner; however, as of December 31, 2014, there was a remaining $0.1 million balance of consigned inventory at the Company’s former contract manufacturing partner and a remaining deposit of $0.4 million relating to service inventory, which is fully reserved.

[2] Transfer from other liabilities is related to obsolete inventory purchased from contract manufacturers during the year which was previously reserved for as an adverse purchase commitment. (Note 10—Other Accrued and Other Long-Term Liabilities and Note 14—Commitments and Contingencies.)