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Inventories and Significant Suppliers - Purchases from Significant Suppliers (Details) - Supplier Concentration Risk - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Inventory Purchases | Qorvo International Pte Ltd. |  |  |
Concentration Risk [Line Items] |  |  |
Purchases from significant supplier |  | $ 43.5 |
Concentration risk percentage |  | 14.20% |
Accounts Payable | Zhejiang Zhen You Electronics Co. Ltd. |  |  |
Concentration Risk [Line Items] |  |  |
Purchases from significant supplier |  |  | $ 11.4
Concentration risk percentage | 11.10% |  |

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