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Income Taxes - Summary of the Provision for Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 0 $ 0 $ 0
State 0 0 0
Current income tax expense (benefit) 0 0 0
Deferred:      
Federal 0 0 (1,594,000)
State 0 0 (504,000)
Deferred income tax expense (benefit) 0 0 (2,098,000)
Income tax expense (benefit) $ 0 $ 0 $ (2,097,766)