Capital Stock and Warrants (Summary of Warrants Outstanding) (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	8,976,167
Pre-Funded Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	199,900
Exercise Price | $ / shares	$ 0.01
Exercise Price 70.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	30,405
Exercise Price | $ / shares	$ 70.00
Exercise Price 82.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	8,640
Exercise Price | $ / shares	$ 82.50
Warrant Expiration Date	Dec. 23, 2018
Exercise Price 107.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	48,841
Exercise Price | $ / shares	$ 107.50
Warrant Expiration Date	Mar. 16, 2020
Exercise Price 40.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	31,519
Exercise Price | $ / shares	$ 40.50
Warrant Expiration Date	Mar. 31, 2021
Exercise Price 120.00 I [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	8,492
Exercise Price | $ / shares	$ 120.00
Warrant Expiration Date	Dec. 31, 2018
Exercise Price 120.00 II [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	8,492
Exercise Price | $ / shares	$ 120.00
Warrant Expiration Date	Mar. 01, 2019
Exercise Price 22.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	106,381
Exercise Price | $ / shares	$ 22.50
Warrant Expiration Date	Jun. 03, 2021
Exercise Price 1.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	533,497
Exercise Price | $ / shares	$ 1.00
Warrant Expiration Date	Nov. 22, 2021
Exercise Price 1.50 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	8,000,000
Exercise Price | $ / shares	$ 1.50
Warrant Expiration Date	May 10, 2022
Excluding Pre-Funded Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Balance at June 30, 2017	8,776,267	[1]
Minimum [Member] | Exercise Price 70.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant Expiration Date	Feb. 04, 2018
Maximum [Member] | Exercise Price 70.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant Expiration Date	Jul. 15, 2018

[1] Balance excludes outstanding pre-funded warrants. As of June 30, 2017, there were 199,900 outstanding pre-funded warrants to purchase shares of common stock which were exercised in full in July 2017 for $0.01 per share.