Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Convertible preferred stock, par value (in dollars per share) $ 0.05 $ 0.05
Convertible preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Convertible preferred stock, shares issued (in shares) 5,003 5,003
Convertible preferred stock, shares outstanding (in shares) 5,003 5,003
Common stock, par value (in dollars per share) $ 0.0075 $ 0.0075
Common stock, shares authorized (in shares) 277,333,332 277,333,332
Common stock, shares issued (in shares) 8,379,163 8,249,158
Common stock, shares outstanding (in shares) 8,379,163 8,249,158