Stockholders' Equity (Schedule of Warrants) (Details) (USD $)	1 Months Ended		9 Months Ended
	Jul. 31, 2009	Sep. 30, 2014	Sep. 30, 2014 3.97 [Member] Warrant [Member]		Sep. 30, 2014 2.50 [Member] Warrant [Member]		Sep. 30, 2014 1.89 [Member] Derivative Instrument Warrants [Member]		Sep. 30, 2014 1.63 [Member] Derivative Instrument Warrants [Member]		Sep. 30, 2014 3.50 [Member] Derivative Instrument Warrants [Member]		Sep. 30, 2014 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		4,495,556	100,778	[1]	2,572,775	[1]	500,000	[2]	903,996	[2]	371,423	[2]	46,584	[1]
Issue Date			Mar. 01, 2007		Jul. 01, 2009		Apr. 01, 2010		Jul. 01, 2010		Jun. 01, 2011		Mar. 01, 2012
Warrant, Exercise price			$ 3.97		$ 2.50		$ 1.89		$ 1.63		$ 3.50		$ 1.61
Warrant expiration date	Jan. 28, 2015		Mar. 01, 2017		Jan. 01, 2015		Oct. 01, 2015		Jan. 01, 2017		Jun. 01, 2016		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 unaudited condensed consolidated statements of operations as other income (expense).