Subsequent Events (Details) - USD ($)		12 Months Ended
	Jan. 12, 2018	Dec. 31, 2017	Dec. 31, 2016
Proceeds from equity offerings, net		$ 9,353,000	$ 7,566,000
Subsequent Event [Member]
Sale of stock, number of shares sold in transaction	4,000,000
Sale of stock, price per share	$ 1.00
Proceeds from equity offerings, gross	$ 4,000,000
Proceeds from equity offerings, net	$ 3,500,000