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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Redeemable Convertible Preferred Stock Series B [Member]    
Preferred stock, par or stated value (in dollars per share) $ 0.01 $ 0.01
Preferred stock liquidation preference value (in dollars per share) $ 1,000 $ 1,000
Preferred stock shares authorized (in shares) 35,000 35,000
Preferred stock shares issued (in shares) 30,700 32,700
Preferred stock shares outstanding (in shares) 30,700 32,700
Common Class A [Member]    
Common stock, par or stated value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock shares issued (in shares) 17,667,857 17,502,673
Common stock shares outstanding (in shares) 17,667,857 17,502,673