CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance (in dollars)	$ 1,676	$ 1,143
Accumulated depreciation of property and equipment	$ 14,449	$ 13,887
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	5,000,000	5,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	50,000,000	50,000,000
Common stock, issued shares	15,603,806	15,428,351
Common stock, outstanding shares	12,967,718	12,809,764
Treasury stock, shares	2,636,088	2,618,587