CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED BALANCE SHEETS
Accounts receivable allowance for doubtful accounts	$ 377	$ 140
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	170,000,000	170,000,000
Common stock, shares issued	19,794,270	19,767,605
Common stock, shares outstanding	19,057,195	18,660,218
Treasury stock at par	737,075	1,107,387