Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 185	$ 96
Preferred stock, par value (USD per share)	$ 0.001
Preferred stock, shares authorized (in shares)	2,000,000
Preferred stock, shares issued (in shares)	546,466
Preferred stock, shares outstanding (in shares)	546,466
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	7,500,000	3,200,000
Common stock, shares issued (in shares)	2,396,219	2,366,219
Common stock, shares outstanding (in shares)	2,396,219	2,366,219