CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance (in dollars)	$ 1,260	$ 1,059
Accumulated depreciation of property and equipment	$ 12,172	$ 9,739
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	14,174,357	13,955,378
Common stock, outstanding shares	11,968,459	11,791,633
Treasury stock, shares	2,205,898	2,163,745