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Stockholders' Equity - Reconciliation of Transactions Under ATM Agreement (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Class of Stock [Line Items]
Net proceeds	$ 1,185,452	$ 340,088
ATM Agreement
Class of Stock [Line Items]
Number of shares sold (in shares)	4,679,904		9,464,764
Gross proceeds	$ 1,385,452		$ 7,346,707
Fees	252,568		278,919
Net proceeds	$ 1,132,884		$ 7,067,788
Average price per share (in dollars per share)	$ 0.30			$ 0.78

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