CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 1,117	$ 461
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	38,900,875	34,350,329
Common stock, shares outstanding	38,900,875	34,350,329