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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories consisted of the following (in thousands):
 
December 31,
2016
 
December 31,
2015
Raw materials
$
24,805

 
$
14,546

Work-in-process
12

 
98

Finished goods
5,005

 
7,485

 
29,822

 
22,129

Less: inventory valuation allowance
(9,801
)
 
(5,317
)
Inventories, net
$
20,021

 
$
16,812
Charges Associated with Inventory
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):
 
2016
 
2015
 
2014
Inventory, net
$
6,120

 
$
1,447

 
$
2,539

Adverse purchase commitments
(1,908
)
 
1,831

 
323

     Net charges
$
4,212

 
$
3,278

 
$
2,862
Change in Inventory Valuation Allowance
The following is a summary of the change in the Company’s inventory valuation allowance for the years ended December 31 (in thousands):
 
2016
 
2015
Inventory valuation allowance, beginning of the year
$
5,317

 
$
2,701

Usage:
 
 
 
Inventory scrapped
(1,636
)
 
(151
)
Inventory utilized
(954
)
 
(856
)
Subtotal—usage
(2,590
)
 
(1,007
)
Write-downs of inventory valuation and transfers from other liabilities (A)
7,074

 
3,623

Inventory valuation allowance, end of the year
$
9,801

 
$
5,317



(A)
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 9—Other Accrued and Other Long-Term Liabilities and Note 13—Commitments and Contingencies.)