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Basis of Presentation and New Accounting Standards (Details)
May 10, 2016
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Sep. 30, 2017
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Dec. 31, 2016
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Jun. 15, 2016
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May 11, 2016
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Basis Of Presentation And New Accounting Standards [Line Items]          
Reverse stock split of common stock 15        
Common stock, shares outstanding (in shares) 200,000,000 34,716,318 21,707,890   13,300,000
Number of shares callable by warrants (in shares) 16,000,000     1 1,100,000
Common stock, shares authorized (in shares) 290,000,000 75,000,000 75,000,000   75,000,000
2014 Equity Incentive Plan [Member]          
Basis Of Presentation And New Accounting Standards [Line Items]          
Number of shares callable by warrants (in shares) 6,500,000       400,000