Capital Stock and Warrants (Summary of Warrants Outstanding) (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	8,531,918
Exercise Price 70.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	19,691
Exercise Price | $ / shares	$ 70.00
Warrant Expiration Date	February 4 to July 15, 2018
Exercise Price 82.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	8,640
Exercise Price | $ / shares	$ 82.50
Warrant Expiration Date	December 23, 2018
Exercise Price 107.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	41,872
Exercise Price | $ / shares	$ 107.50
Warrant Expiration Date	March 16, 2020
Exercise Price 40.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	31,519
Exercise Price | $ / shares	$ 40.50
Warrant Expiration Date	March 31, 2021
Exercise Price 120.00 I [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	8,492
Exercise Price | $ / shares	$ 120.00
Warrant Expiration Date	December 31, 2018
Exercise Price 120.00 II [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	8,492
Exercise Price | $ / shares	$ 120.00
Warrant Expiration Date	March 1, 2019
Exercise Price 22.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	106,381
Exercise Price | $ / shares	$ 22.50
Warrant Expiration Date	June 3, 2021
Exercise Price 0.57 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	306,831
Exercise Price | $ / shares	$ 0.57
Warrant Expiration Date	November 22, 2021
Exercise Price 1.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants	8,000,000
Exercise Price | $ / shares	$ 1.50
Warrant Expiration Date	May 10, 2022