Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Reserves for accounts receivable	$ 913	$ 1,821
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)	174,663,000	172,440,000