Condensed Consolidated Balance Sheets - Unaudited (Parenthetical) - USD ($) $ in Millions	Oct. 02, 2020	Dec. 31, 2019
Current assets:
Allowance for doubtful accounts	$ 0.2	$ 2.4
Stockholders’ equity:
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	32,875,166	32,847,017
Common stock, shares outstanding (in shares)	32,875,166	32,700,471
Treasury stock, shares (in shares)	0	146,546