Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Allowance for doubtful accounts	$ 2,836	$ 2,263
Stockholders' equity:
Common stock, par value (usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (shares)	225,375,000	219,422,000
Common stock, shares outstanding (shares)	225,375,000	219,422,000
Treasury stock (shares)	1,778,000	3,333,000