CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 428	$ 513
Preferred stock, par value (in dollars per share)	$ 0.05	$ 0.05
Preferred stock, authorized (in shares)	4,000,000	4,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.05	$ 0.05
Common stock, authorized (in shares)	25,000,000	25,000,000
Common stock, outstanding (in shares)	14,647,091	14,905,776
Treasury stock (in shares)	(460,823)	(82,186)