CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 748	$ 514
Common stock, authorized (in shares)	75,000,000	75,000,000
Common stock, issued (in shares)	44,066,000	43,578,000
Common stock, outstanding (in shares)	44,066,000	43,578,000