CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Consolidated Balance Sheets
Allowance of Accounts receivable	$ 4,651	$ 3,787
Common stock par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	74,076,286	72,761,941
Common stock, shares outstanding	74,076,286	72,761,941