CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 315	$ 249
Current portion of term loan credit agreement, deferred costs	69	67
Revolving and term loan credit agreement, deferred costs	$ 185	$ 196
Common stock, authorized (in shares)	75,000	75,000
Common stock, issued (in shares)	36,502	35,861
Common stock, outstanding (in shares)	36,502	35,861