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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Allowance for doubtful notes receivable $ 236 $ 96
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 31,950,777 26,021,552
Common stock, shares outstanding (in shares) 31,950,777 26,021,552
Series B Preferred Stock [Member]    
Series B preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Series B preferred stock, shares issued (in shares) 4,965,850 2,890,850
Series B preferred stock, shares outstanding (in shares) 4,965,850 2,890,850