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Fair Value Measurements (Detail) - USD ($) $ in Thousands | Jul. 02, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | $ 132,575 | $ 129,507
Convertible Note due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | 36,367 | 35,925
Convertible Note due 2024 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Carrying amount | 96,208 | 93,582
Level 2 [Member] | Convertible Note due 2022 | Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible Debt, Fair Value Disclosures | 59,577 | 54,204
Level 2 [Member] | Convertible Note due 2024 | Fair Value, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible Debt, Fair Value Disclosures | $ 135,297 | $ 125,953

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