Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 04, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Amortized cost of current investments	$ 189,818	$ 102,258
Allowance for credit losses	0	0
Allowance for credit losses, current	803	831
Amortized cost of non-current investments	542,015	390,417
Allowance for credit losses, non-current	$ 0	$ 0
Common stock par value (in dollars per share)	$ 0.002	$ 0.002
Common stock shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	176,707,000	175,790,000
Common stock, shares outstanding (in shares)	176,707,000	175,790,000
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock shares authorized (in shares)	400,000	400,000
Preferred stock shares issued (in shares)	0	0
Preferred stock shares outstanding (in shares)	0	0