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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) - USD ($) $ in Thousands | Apr. 02, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | $ 94,884 | $ 129,507
Convertible Note due 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | 94,884 | 93,582
Convertible Note due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | 36,143 | 35,925
Level 2 [Member] | Convertible Note due 2024 | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 131,197 | 125,953
Level 2 [Member] | Convertible Note due 2022 | Fair Value, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible Debt, Fair Value Disclosures | $ 57,628 | $ 54,204

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