CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Condensed Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 478	$ 1,092
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	40,123,841	39,589,755
Common stock, shares outstanding	40,123,841	39,589,755