Stockholders' Equity (Schedule of Warrants By Exercise Price) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Number of Shares	1,136,753	1,214,686
Exercise Price	$ 3.93	$ 4.93
3/10/2011 [Member]
Issuance Date	Mar. 10, 2011
Number of Shares	17,392
Exercise Price	$ 0.48
Expiration Date	Mar. 10, 2021
7/23/2013 [Member]
Issuance Date	Jul. 23, 2013
Number of Shares	125,000
Exercise Price	$ 12.50
Expiration Date	Jul. 23, 2018
3/23/2016 [Member]
Issuance Date	Mar. 23, 2016
Number of Shares	2,961,571
Exercise Price	$ 1.00
Expiration Date	Mar. 23, 2021