CONSOLIDATED BALANCE SHEETS (parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
CONSOLIDATED BALANCE SHEETS
Allowance for accounts receivable	$ 422	$ 386
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	23,015,781	22,496,999
Common stock, shares outstanding	22,817,540	22,321,310
Treasury stock (in shares)	198,241	175,689