| Balance Sheet Details | 
Balance Sheet Details 
Cash and cash equivalents and investments consist of the following: 
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 | 
 | 
 | 
 | 
 | 
 | 
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 | 
 
   | 
December 31, 2016  | 
   | 
December 31, 2015  | 
 
   | 
(in thousands)  | 
 
Cash and cash equivalents  | 
$  | 
82,896  | 
 
  | 
   | 
$  | 
67,956  | 
 
  | 
 
Short-term investments  | 
47,918  | 
 
  | 
   | 
43,300  | 
 
  | 
 
Long-term investments  | 
5,991  | 
 
  | 
   | 
19,242  | 
 
  | 
 
   | 
$  | 
136,805  | 
 
  | 
   | 
$  | 
130,498  | 
 
  | 
 
  
 
 
Inventory consists of the following: 
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 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
December 31, 2016  | 
   | 
December 31, 2015  | 
 
   | 
(in thousands)  | 
 
Work-in-process  | 
$  | 
13,947  | 
 
  | 
   | 
$  | 
15,713  | 
 
  | 
 
Finished goods  | 
12,636  | 
 
  | 
   | 
16,730  | 
 
  | 
 
   | 
$  | 
26,583  | 
 
  | 
   | 
$  | 
32,443  | 
 
  | 
 
  
 
 
Property and equipment consist of the following: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
 Useful Life 
(in Years) 
 | 
   | 
December 31, 2016  | 
   | 
December 31, 2015  | 
 
   | 
   | 
   | 
(in thousands)  | 
 
Furniture and fixtures  | 
5  | 
   | 
$  | 
1,983  | 
 
  | 
   | 
$  | 
2,458  | 
 
  | 
 
Machinery and equipment  | 
3 -5  | 
   | 
27,028  | 
 
  | 
   | 
23,679  | 
 
  | 
 
Masks and production equipment  | 
2  | 
   | 
9,153  | 
 
  | 
   | 
8,062  | 
 
  | 
 
Software  | 
3  | 
   | 
3,625  | 
 
  | 
   | 
3,017  | 
 
  | 
 
Leasehold improvements  | 
1 -5  | 
   | 
11,635  | 
 
  | 
   | 
9,573  | 
 
  | 
 
Construction in progress  | 
N/A  | 
   | 
39  | 
 
  | 
   | 
62  | 
 
  | 
 
   | 
   | 
   | 
53,463  | 
 
  | 
   | 
46,851  | 
 
  | 
 
Less accumulated depreciation and amortization  | 
   | 
   | 
(32,914  | 
)  | 
   | 
(24,993  | 
)  | 
 
   | 
   | 
   | 
$  | 
20,549  | 
 
  | 
   | 
$  | 
21,858  | 
 
  | 
 
  
 
 
Deferred revenue and deferred profit consist of the following: 
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 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
December 31, 2016  | 
   | 
December 31, 2015  | 
 
   | 
(in thousands)  | 
 
Deferred revenue—rebates  | 
$  | 
464  | 
 
  | 
   | 
$  | 
118  | 
 
  | 
 
Deferred revenue—distributor transactions  | 
7,987  | 
 
  | 
   | 
5,695  | 
 
  | 
 
Deferred cost of net revenue—distributor transactions  | 
(2,460  | 
)  | 
   | 
(1,747  | 
)  | 
 
   | 
$  | 
5,991  | 
 
  | 
   | 
$  | 
4,066  | 
 
  | 
 
  
 
 
Accrued price protection liability consists of the following activity: 
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 | 
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   | 
Years Ended December 31,  | 
 
   | 
2016  | 
   | 
2015  | 
 
   | 
(in thousands)  | 
 
Beginning balance  | 
$  | 
20,026  | 
 
  | 
   | 
$  | 
10,018  | 
 
  | 
 
Additional liability from acquisition  | 
—  | 
 
  | 
   | 
3,486  | 
 
  | 
 
Charged as a reduction of revenue  | 
43,931  | 
 
  | 
   | 
39,304  | 
 
  | 
 
Reversal of unclaimed rebates  | 
(1,303  | 
)  | 
   | 
(158  | 
)  | 
 
Payments  | 
(47,478  | 
)  | 
   | 
(32,624  | 
)  | 
 
Ending balance  | 
$  | 
15,176  | 
 
  | 
   | 
$  | 
20,026  | 
 
  | 
 
  
 
 
Accrued expenses and other current liabilities consist of the following: 
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   | 
December 31, 2016  | 
   | 
December 31, 2015  | 
 
   | 
(in thousands)  | 
 
Accrued technology license payments  | 
$  | 
5,850  | 
 
  | 
   | 
$  | 
3,000  | 
 
  | 
 
Accrued professional fees  | 
1,620  | 
 
  | 
   | 
1,196  | 
 
  | 
 
Accrued engineering and production costs  | 
1,232  | 
 
  | 
   | 
826  | 
 
  | 
 
Accrued restructuring  | 
536  | 
 
  | 
   | 
3,416  | 
 
  | 
 
Accrued royalty  | 
846  | 
 
  | 
   | 
2,042  | 
 
  | 
 
Accrued leases  | 
1,560  | 
 
  | 
   | 
—  | 
 
  | 
 
Accrued customer credits  | 
1,207  | 
 
  | 
   | 
951  | 
 
  | 
 
Other  | 
3,507  | 
 
  | 
   | 
3,937  | 
 
  | 
 
   | 
$  | 
16,358  | 
 
  | 
   | 
$  | 
15,368  | 
 
  | 
 
  
 
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