| Balance Sheet Details (Tables)
 | 3 Months Ended | 
| Mar. 31, 2021 | 
|---|
| Balance Sheet Related Disclosures [Abstract] |  | 
| Cash, Cash Equivalents and Investments | Cash, cash equivalents and restricted cash consist of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | March 31, 2021 |  | December 31, 2020 |  
|  | (in thousands) |  
| Cash and cash equivalents | $ | 148,095 |  |  | $ | 148,901 |  |  
| Short-term restricted cash | 114 |  |  | 115 |  |  
| Long-term restricted cash | 984 |  |  | 1,018 |  |  
| Total cash, cash equivalents and restricted cash | $ | 149,193 |  |  | $ | 150,034 |  |  
|  |  |  |  |  
|  |  |  |  |  
|  |  |  |  |  | 
| Inventory | Inventory consists of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | March 31, 2021 |  | December 31, 2020 |  
|  | (in thousands) |  
|  |  |  |  |  
| Work-in-process | $ | 46,901 |  |  | $ | 35,852 |  |  
| Finished goods | 45,253 |  |  | 61,987 |  |  
|  |  |  |  |  
|  |  |  |  |  
|  | $ | 92,154 |  |  | $ | 97,839 |  |  | 
| Prepaid and Other Current Assets | Prepaid and other current assets consist of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | March 31, 2021 |  | December 31, 2020 |  
|  | (in thousands) |  
| Prepaid expenses | $ | 7,864 |  |  | $ | 7,674 |  |  
| Other receivables | 4,472 |  |  | 32,762 |  |  
| Other current assets | 4,760 |  |  | 6,985 |  |  
|  | $ | 17,096 |  |  | $ | 47,421 |  | As of March 31, 2021, other receivables of $4.5 million consists primarily of amounts due from Intel for reimbursement of certain employee-related costs pursuant to the Asset Purchase Agreement (Note 3).  
 As of December 31, 2020, other receivables of $32.8 million consist of amounts due from Intel of $28.4 million for amounts collected on the Company’s behalf from customers on sales of the Company’s products under the transition services agreement and of $4.4 million for reimbursement of certain severance-related costs pursuant to the Asset Purchase Agreement. | 
| Property and Equipment | Property and equipment, net consists of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Useful Life (in Years)
 |  | March 31, 2021 |  | December 31, 2020 |  
|  |  |  | (in thousands) |  
| Furniture and fixtures | 5 |  | $ | 2,519 |  |  | $ | 2,524 |  |  
| Machinery and equipment | 3-5 |  | 54,021 |  |  | 55,456 |  |  
| Masks and production equipment | 2-5 |  | 21,601 |  |  | 19,205 |  |  
| Software | 3 |  | 7,831 |  |  | 7,194 |  |  
| Leasehold improvements | 1-5 |  | 16,628 |  |  | 16,871 |  |  
| Construction in progress | N/A |  | 9,261 |  |  | 8,050 |  |  
|  |  |  | 111,861 |  |  | 109,300 |  |  
| Less: accumulated depreciation and amortization |  |  | (71,074) |  |  | (69,830) |  |  
|  |  |  | $ | 40,787 |  |  | $ | 39,470 |  |  | 
| Price Protection Liability | Accrued price protection liability consists of the following activity: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Three Months Ended March 31, |  
|  | 2021 |  | 2020 |  
|  | (in thousands) |  
| Beginning balance | $ | 47,766 |  |  | $ | 12,557 |  |  
|  |  |  |  |  
| Charged as a reduction of revenue | 24,423 |  |  | 1,399 |  |  
|  |  |  |  |  
| Payments | (17,160) |  |  | (5,932) |  |  
| Ending balance | $ | 55,029 |  |  | $ | 8,024 |  |  | 
| Accrued Expenses | Accrued expenses and other current liabilities consist of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | March 31, 2021 |  | December 31, 2020 |  |  |  
|  | (in thousands) |  |  |  
| Deferred purchase price payments | $ | 14,794 |  |  | $ | 34,484 |  |  |  |  
| Payables under transition services agreement | 1,662 |  |  | $ | 17,420 |  |  |  |  
| Accrued technology license payments | 4,950 |  |  | 5,821 |  |  |  |  
| Accrued professional fees | 5,075 |  |  | 2,620 |  |  |  |  
| Accrued engineering and production costs | 2,019 |  |  | 3,448 |  |  |  |  
| Accrued restructuring | 910 |  |  | 3,628 |  |  |  |  
|  |  |  |  |  |  |  
| Accrued royalty | 1,779 |  |  | 1,965 |  |  |  |  
| Short-term lease liabilities | 9,456 |  |  | 8,144 |  |  |  |  
|  |  |  |  |  |  |  
| Accrued customer credits | 809 |  |  | 1,135 |  |  |  |  
|  |  |  |  |  |  |  
| Income tax liability | 4,855 |  |  | 1,193 |  |  |  |  
| Customer contract liabilities | 1,818 |  |  | 29 |  |  |  |  
| Accrued obligations to customers for price adjustments | 19,291 |  |  | 10,277 |  |  |  |  
| Accrued obligations to customers for stock rotation rights | 2,601 |  |  | 2,036 |  |  |  |  
| Other | 7,736 |  |  | 13,642 |  |  |  |  
|  | $ | 77,755 |  |  | $ | 105,842 |  |  |  |  | 
| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table summarizes the change in balances of accumulated other comprehensive income (loss) by component: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  |  |  | Cumulative Translation Adjustments |  |  |  | Pension and Other Defined Benefit Plan Obligation |  | Total |  
|  |  |  | (in thousands) |  
| Balance at December 31, 2020 |  |  | $ | 263 |  |  |  |  | $ | 1,172 |  |  | $ | 1,435 |  |  
| Other comprehensive income (loss) before reclassifications, net of tax |  |  | (989) |  |  |  |  | — |  |  | (989) |  |  
|  |  |  |  |  |  |  |  |  |  |  
|  |  |  |  |  |  |  |  |  |  |  
| Balance at March 31, 2021 |  |  | $ | (726) |  |  |  |  | $ | 1,172 |  |  | $ | 446 |  |  |