Description of Business, Basis of Presentation and Summary of Significant Accounting Policies - Basic and Diluted Income Per Share (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Numerator:
Net (loss) income	$ (4,212,661)	$ 445,846	$ (64,591,727)
Denominator:
Weighted-average shares outstanding— basic (in shares)	71,981,487	61,093,810
Effect of dilutive securities (in shares)	0	5,110,810
Weighted-average shares outstanding— diluted (in shares)	71,981,487	66,204,620
Basic income per share (in dollars per share)	$ (0.06)	$ 0.01
Diluted income per share (in dollars per share)	$ (0.06)	$ 0.01