Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Apr. 01, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Accounts receivable, net of allowance for contract losses and doubtful accounts	$ 4,899	$ 4,423
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	65,707,000	65,707,000
Treasury stock, shares	13,885,000	13,591,000