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Impact of Recently Issued Accounting Standards - Cumulative Effect of ASU 2016-01 (Details) - USD ($)
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Equity [Abstract]      
Accumulated deficit $ (587,130,576) $ (523,124,951) $ (523,356,317)
Accumulated other comprehensive loss $ (281,760) (348,371) $ (117,005)
Accounting Standards Update 2016-01      
Equity [Abstract]      
Accumulated deficit   231,366  
Accumulated other comprehensive loss   $ (231,366)