Stockholders' Equity (Narrative) (Details) - shares		6 Months Ended
	Jan. 28, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2008	Dec. 31, 2007
Stockholders Equity [Line Items]
Warrants issued to purchase shares of common stock		1,922,781	5,620,128
Warrants [Member]
Stockholders Equity [Line Items]
Number of common shares expired underlying stock purchase warrants	2,572,775
2007 Long Term Incentive Plan [Member]
Stockholders Equity [Line Items]
Common stock reserved				4,600,000	3,500,000
Shares approved for issuance		10,300,000
Shares available for grant		3,700,000
Options award term		10 years