CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Allowance for doubtful accounts, current	$ 131	$ 135
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	6,000	6,000
Preferred stock, shares outstanding (in shares)	6,000	6,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	2,181,898	2,166,898
Common stock, shares outstanding (in shares)	2,181,898	2,166,898