Balance Sheet Details (Tables)
   | 
6 Months Ended | 
Jun. 30, 2017  | 
| Balance Sheet Related Disclosures [Abstract] | 
 
 | 
| Cash, Cash Equivalents and Investments | 
Cash, cash equivalents, restricted cash and investments consist of the following: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
June 30, 2017  | 
   | 
December 31, 2016  | 
 
   | 
(in thousands)  | 
 
Cash and cash equivalents  | 
$  | 
87,568  | 
 
  | 
   | 
$  | 
81,086  | 
 
  | 
 
Short-term restricted cash  | 
615  | 
 
  | 
   | 
614  | 
 
  | 
 
Long-term restricted cash  | 
1,908  | 
 
  | 
   | 
1,196  | 
 
  | 
 
Total cash, cash equivalents and restricted cash  | 
90,091  | 
 
  | 
   | 
82,896  | 
 
  | 
 
Short-term investments  | 
—  | 
 
  | 
   | 
47,918  | 
 
  | 
 
Long-term investments  | 
—  | 
 
  | 
   | 
5,991  | 
 
  | 
 
   | 
$  | 
90,091  | 
 
  | 
   | 
$  | 
136,805  | 
 
  | 
 
  
 
 | 
| Inventory | 
Inventory consists of the following: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
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   | 
June 30, 2017  | 
   | 
December 31, 2016  | 
 
   | 
(in thousands)  | 
 
Work-in-process  | 
$  | 
35,528  | 
 
  | 
   | 
$  | 
13,947  | 
 
  | 
 
Finished goods  | 
42,031  | 
 
  | 
   | 
12,636  | 
 
  | 
 
   | 
$  | 
77,559  | 
 
  | 
   | 
$  | 
26,583  | 
 
  | 
 
  
 
 | 
| Property and Equipment | 
Property and equipment consist of the following: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Useful Life (in Years)  | 
   | 
June 30, 2017  | 
   | 
December 31, 2016  | 
 
   | 
   | 
   | 
(in thousands)  | 
 
Furniture and fixtures  | 
5  | 
   | 
$  | 
2,266  | 
 
  | 
   | 
$  | 
1,983  | 
 
  | 
 
Machinery and equipment  | 
3-5  | 
   | 
32,027  | 
 
  | 
   | 
27,028  | 
 
  | 
 
Masks and production equipment  | 
2  | 
   | 
10,414  | 
 
  | 
   | 
9,153  | 
 
  | 
 
Software  | 
3  | 
   | 
4,979  | 
 
  | 
   | 
3,625  | 
 
  | 
 
Leasehold improvements  | 
1-5  | 
   | 
12,622  | 
 
  | 
   | 
11,635  | 
 
  | 
 
Construction in progress  | 
N/A  | 
   | 
200  | 
 
  | 
   | 
39  | 
 
  | 
 
   | 
   | 
   | 
62,508  | 
 
  | 
   | 
53,463  | 
 
  | 
 
Less accumulated depreciation and amortization  | 
   | 
   | 
(38,039  | 
)  | 
   | 
(32,914  | 
)  | 
 
   | 
   | 
   | 
$  | 
24,469  | 
 
  | 
   | 
$  | 
20,549  | 
 
  | 
 
  
 
 | 
| Deferred Revenue and Deferred Profit | 
Deferred revenue and deferred profit consist of the following: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
June 30, 2017  | 
   | 
December 31, 2016  | 
 
   | 
(in thousands)  | 
 
Deferred revenue—rebates  | 
$  | 
161  | 
 
  | 
   | 
$  | 
464  | 
 
  | 
 
Deferred revenue—distributor transactions  | 
17,681  | 
 
  | 
   | 
7,987  | 
 
  | 
 
Deferred cost of net revenue—distributor transactions  | 
(4,525  | 
)  | 
   | 
(2,460  | 
)  | 
 
   | 
$  | 
13,317  | 
 
  | 
   | 
$  | 
5,991  | 
 
  | 
 
  
 
 | 
| Price Protection Liability | 
ccrued price protection liability consists of the following activity: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
Six Months Ended June 30,  | 
 
   | 
2017  | 
   | 
2016  | 
 
   | 
(in thousands)  | 
 
Beginning balance  | 
$  | 
15,176  | 
 
  | 
   | 
$  | 
20,026  | 
 
  | 
 
Charged as a reduction of revenue  | 
23,445  | 
 
  | 
   | 
22,759  | 
 
  | 
 
Reversal of unclaimed rebates  | 
(40  | 
)  | 
   | 
(1,302  | 
)  | 
 
Payments  | 
(13,958  | 
)  | 
   | 
(23,213  | 
)  | 
 
Ending balance  | 
$  | 
24,623  | 
 
  | 
   | 
$  | 
18,270  | 
 
  | 
 
  
 
 | 
| Accrued Expenses | 
Accrued expenses and other current liabilities consist of the following: 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
June 30, 2017  | 
   | 
December 31, 2016  | 
 
   | 
(in thousands)  | 
 
Accrued technology license payments  | 
$  | 
5,705  | 
 
  | 
   | 
$  | 
5,850  | 
 
  | 
 
Accrued professional fees  | 
2,808  | 
 
  | 
   | 
1,620  | 
 
  | 
 
Accrued engineering and production costs  | 
847  | 
 
  | 
   | 
1,232  | 
 
  | 
 
Accrued restructuring  | 
4,896  | 
 
  | 
   | 
536  | 
 
  | 
 
Accrued royalty  | 
1,095  | 
 
  | 
   | 
846  | 
 
  | 
 
Accrued leases - other  | 
1,565  | 
 
  | 
   | 
1,560  | 
 
  | 
 
Accrued customer credits  | 
1,154  | 
 
  | 
   | 
1,207  | 
 
  | 
 
Income tax liability  | 
14,447  | 
 
  | 
   | 
235  | 
 
  | 
 
Other  | 
6,088  | 
 
  | 
   | 
3,272  | 
 
  | 
 
   | 
$  | 
38,605  | 
 
  | 
   | 
$  | 
16,358  | 
 
  | 
 
  
 
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