Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Trade, allowance for doubtful accounts	$ 176	$ 223
Notes and other, allowance for doubtful accounts	$ 0	$ 0
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100	100
Common stock, shares issued (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100