Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Allowances for doubtful accounts	$ 7,767	$ 4,480
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	77,972,828	78,062,451
Common stock, shares outstanding	77,972,828	78,062,451
Series A Convertible Preferred Stock [Member]
Preferred Stock, par value	$ 0.001	$ 0.001
Preferred Stock, shares authorized	1,000,000	1,000,000
Preferred Stock, shares issued	40,624	40,624
Preferred Stock, shares outstanding	40,624	40,624