| Balance Sheet Details (Tables)
 | 9 Months Ended | 
| Sep. 30, 2020 | 
|---|
| Balance Sheet Related Disclosures [Abstract] |  | 
| Cash, Cash Equivalents and Investments | Cash, cash equivalents and restricted cash consist of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | September 30, 2020 |  | December 31, 2019 |  
|  | (in thousands) |  
| Cash and cash equivalents | $ | 96,570 |  |  | $ | 92,708 |  |  
| Short-term restricted cash | 111 |  |  | 349 |  |  
| Long-term restricted cash | 61 |  |  | 60 |  |  
| Total cash, cash equivalents and restricted cash | $ | 96,742 |  |  | $ | 93,117 |  |  
|  |  |  |  |  
|  |  |  |  |  
|  |  |  |  |  | 
| Inventory | Inventory consists of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | September 30, 2020 |  | December 31, 2019 |  
|  | (in thousands) |  
|  |  |  |  |  
| Work-in-process | $ | 48,023 |  |  | $ | 14,525 |  |  
| Finished goods | 56,448 |  |  | 16,985 |  |  
|  |  |  |  |  
|  |  |  |  |  
|  | $ | 104,471 |  |  | $ | 31,510 |  |  | 
| Prepaid and Other Current Assets | Prepaid and other current assets consist of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | September 30, 2020 |  | December 31, 2019 |  
|  | (in thousands) |  
| Prepaid expenses | $ | 4,898 |  |  | $ | 3,366 |  |  
| Other receivables | 28,960 |  |  | — |  |  
| Other current assets | 9,688 |  |  | 3,426 |  |  
|  | $ | 43,546 |  |  | $ | 6,792 |  | As of September 30, 2020, other receivables of $29.0 million consist of amounts due from Intel of $24.7 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 $4.2 million for reimbursement of certain severance-related costs pursuant to the Asset Purchase Agreement (Note 3). | 
| Property and Equipment | Property and equipment, net consists of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Useful Life (in Years)
 |  | September 30, 2020 |  | December 31, 2019 |  
|  |  |  | (in thousands) |  
| Furniture and fixtures | 5 |  | $ | 2,517 |  |  | $ | 2,199 |  |  
| Machinery and equipment | 3-5 |  | 54,194 |  |  | 35,660 |  |  
| Masks and production equipment | 2-5 |  | 19,228 |  |  | 15,209 |  |  
| Software | 3 |  | 6,867 |  |  | 5,956 |  |  
| Leasehold improvements | 1-5 |  | 16,687 |  |  | 16,186 |  |  
| Construction in progress | N/A |  | 3,136 |  |  | 746 |  |  
|  |  |  | 102,629 |  |  | 75,956 |  |  
| Less: accumulated depreciation and amortization |  |  | (65,371) |  |  | (59,343) |  |  
|  |  |  | $ | 37,258 |  |  | $ | 16,613 |  |  | 
| Price Protection Liability | Accrued price protection liability consists of the following activity: 
|  |  |  |  |  |  |  |  |  |  |  |  |  
|  | Nine Months Ended September 30, |  
|  | 2020 |  | 2019 |  
|  | (in thousands) |  
| Beginning balance | $ | 12,557 |  |  | $ | 16,454 |  |  
|  |  |  |  |  
| Charged as a reduction of revenue | 17,358 |  |  | 19,884 |  |  
| Reversal of unclaimed rebates | (159) |  |  | (719) |  |  
| Payments | (11,722) |  |  | (21,998) |  |  
| Ending balance | $ | 18,034 |  |  | $ | 13,621 |  |  | 
| Accrued Expenses | Accrued expenses and other current liabilities consist of the following: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | September 30, 2020 |  | December 31, 2019 |  |  |  
|  | (in thousands) |  |  |  
| Deferred purchase price payments | $ | 34,100 |  |  | $ | — |  |  |  |  
| Accrued technology license payments | 5,969 |  |  | 4,500 |  |  |  |  
| Accrued professional fees | 7,181 |  |  | 861 |  |  |  |  
| Accrued engineering and production costs | 12,027 |  |  | 4,491 |  |  |  |  
| Accrued restructuring | 5,596 |  |  | 294 |  |  |  |  
|  |  |  |  |  |  |  
| Accrued royalty | 1,003 |  |  | 923 |  |  |  |  
| Short-term lease liabilities | 6,225 |  |  | 4,810 |  |  |  |  
| Current portion of debt | 7,785 |  |  | — |  |  |  |  
| Accrued customer credits | 2,590 |  |  | 832 |  |  |  |  
|  |  |  |  |  |  |  
| Income tax liability | 684 |  |  | 65 |  |  |  |  
| Customer contract liabilities | 14 |  |  | 107 |  |  |  |  
| Accrued obligations to customers for price adjustments | 12,137 |  |  | 8,382 |  |  |  |  
| Accrued obligations to customers for stock rotation rights | 1,632 |  |  | 1,410 |  |  |  |  
| Other | 7,780 |  |  | 4,496 |  |  |  |  
|  | $ | 104,723 |  |  | $ | 31,171 |  |  |  |  | 
| 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 |  | Interest Rate Hedge |  | Total |  
|  |  |  | (in thousands) |  
| Balance at December 31, 2019 |  |  | $ | (747) |  |  | $ | (140) |  |  | $ | (887) |  |  
| Current period other comprehensive income (loss) |  |  | 415 |  |  | 22 |  |  | 437 |  |  
| Balance at September 30, 2020 |  |  | $ | (332) |  |  | $ | (118) |  |  | $ | (450) |  |  |