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Inventories (Tables)
 12 Months Ended
Dec. 31, 2012
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consisted of the following (in thousands):
 
December 31,
2012
 
December 31,
2011
Raw materials
$
10,420

 
$
10,925

Work-in-process
605

 
599

Finished goods
11,245

 
20,127

 
22,270

 
31,651

Less: inventory valuation allowance
(2,199
)
 
(4,640
)
Inventories, net
$
20,071

 
$
27,011
Schedule of Inventory Deposit [Table Text Block]
 
December 31,
2012
 
December 31,
2011
Inventory deposit (A)
$
11,637

 
$
11,578

Less: inventory deposit valuation allowance
(2,801
)
 
(3,135
)
Inventory deposit, net
$
8,836

 
$
8,443


(A)
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 15 - Commitments and Contingencies for additional information regarding the Company's adverse purchase commitment liability.
Charges Associated with Inventory [Table Text Block]
The Company recorded the following charges associated with the valuation of inventory, inventory deposit and the adverse purchase commitment liability for the years ended December 31 (in thousands):
 
2012
 
2011
 
2010
Inventory, net
$
1,928

 
$
2,668

 
$
1,368

Inventory deposit, net
926

 
1,096

 
1,531

Adverse purchase commitments
31

 
733

 
318
Change in Inventory Valuation Allowance [Table Text Block]
 
2012
 
2011
Inventory valuation allowance, beginning of the year
$
4,640

 
$
3,547

Usage:
 
 
 
Inventory scrapped
(3,397
)
 
(1,767
)
Inventory utilized
(696
)
 
(933
)
Subtotal—usage
(4,093
)
 
(2,700
)
Write-downs of inventory valuation
1,928

 
2,668

Transfer from other liabilities (A)
29

 
1,398

Transfer to inventory deposit valuation allowance
(305
)
 
(273
)
Inventory valuation allowance, end of the year
$
2,199

 
$
4,640