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Redeemable Convertible Preferred Stock (Details Textual)
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Temporary Equity [Line Items]  
Preferred Stock, Shares Authorized | shares 1,000,000
Series G Preferred Stock [Member]  
Temporary Equity [Line Items]  
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 1,000
Convertible Preferred Stock, Terms of Conversion conversion price equal to 85% of the lowest sale price of the common stock on its listed market over the five trading days preceding the date of conversion (“Beneficial Conversion Feature”), subject to a maximum conversion price.
Preferred Stock, Shares Outstanding | shares 150,175
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 1,000
Preferred Stock, Liquidation Preference, Value | $ $ 168,496