Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Consolidated Balance Sheets
Allowances on accounts receivable	$ 3,080	$ 2,919
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	86,223,000	78,005,000
Common stock, shares outstanding	86,223,000	78,005,000