Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 04, 2021	Dec. 31, 2020
Assets:
Money market instruments	$ 25,375	$ 2,464
Financial assets at fair value	633,596
Corporate Bonds
Assets:
Financial assets at fair value	384,761
Treasury Bills
Assets:
Financial assets at fair value	131,409
Asset-Backed Securities
Assets:
Financial assets at fair value	79,400
Agency Bonds
Assets:
Financial assets at fair value	18,961
Sovereign Bonds
Assets:
Financial assets at fair value	12,050
Municipal Bonds
Assets:
Financial assets at fair value	7,015
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	25,375
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets:
Money market instruments	0
Economic hedge forward contracts	8
Liabilities:
Economic hedge forward contracts	124
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Bonds
Assets:
Financial assets at fair value	384,761
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Treasury Bills
Assets:
Financial assets at fair value	131,409
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-Backed Securities
Assets:
Financial assets at fair value	79,400
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Agency Bonds
Assets:
Financial assets at fair value	18,961
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Sovereign Bonds
Assets:
Financial assets at fair value	12,050
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Commercial Paper
Assets:
Financial assets at fair value	10,000
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Municipal Bonds
Assets:
Financial assets at fair value	$ 7,015