Stockholders' Equity (Schedule of Warrants) (Details) (USD $)	1 Months Ended	3 Months Ended
	Jul. 31, 2009	Mar. 31, 2015		Mar. 31, 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		100,778	[1]
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		500,000	[2]
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		903,996	[2]
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		371,423	[2]
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		46,584	[1]
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).