Stockholders' Equity (Schedule of Warrants) (Details) - $ / shares		1 Months Ended	6 Months Ended
		Jul. 31, 2009	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Common Shares Underlying Warrants			1,922,781	5,620,128
Expiration Date		Jan. 28, 2015
3.97 [Member] | Warrant [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Common Shares Underlying Warrants	[1]		100,778
Issue Date			Mar. 01, 2007
Warrant, Exercise price			$ 3.97
Expiration Date			Mar. 01, 2017
1.89 [Member] | Derivative Instrument Warrants [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Common Shares Underlying Warrants	[2]		500,000
Issue Date			Apr. 01, 2010
Warrant, Exercise price			$ 1.89
Expiration Date			Oct. 01, 2015
1.63 [Member] | Derivative Instrument Warrants [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Common Shares Underlying Warrants	[2]		903,996
Issue Date			Jul. 01, 2010
Warrant, Exercise price			$ 1.63
Expiration Date			Jan. 01, 2017
3.50 [Member] | Derivative Instrument Warrants [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Common Shares Underlying Warrants	[2]		371,423
Issue Date			Jun. 01, 2011
Warrant, Exercise price			$ 3.50
Expiration Date			Jun. 01, 2016
1.61 [Member] | Warrant [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Common Shares Underlying Warrants	[1]		46,584
Issue Date			Mar. 01, 2012
Warrant, Exercise price			$ 1.61
Expiration Date			Mar. 01, 2022

[1] These warrants to purchase common stock are classified as equity.

[2] Because of the presence of net settlement provisions, these warrants to purchase common stock are classified as derivative liabilities. The fair value of these liabilities (see Note 3 – Fair Value Measurements ) is remeasured at the end of every reporting period and the change in fair value is reported in the accompanying unaudited condensed consolidated statements of operations as other income (expense).