Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders Deficit (USD $)	Total	Common Stock	Distributions In Excess of Capital	Treasury Stock	Accumulated Deficit	Series A Redeemable Convertible Preferred Stock	Series B Redeemable Convertible Preferred Stock	Series C-1 Redeemable Convertible Preferred Stock	Series C-2 Redeemable Convertible Preferred Stock	Series D Redeemable Convertible Preferred Stock	Series E Redeemable Convertible Preferred Stock
Balance at Dec. 31, 2014	$ (69,669,926)	$ 333	$ (1,426,556)	$ (75,000)	$ (68,168,703)	$ 1,402,687	$ 2,099,310	$ 4,567,525	$ 2,223,506	$ 37,174,666	$ 8,454,899
Balance, shares at Dec. 31, 2014		332,607
Balance, Redeemable convertible preferred stock shares at Dec. 31, 2014						1,292,084	6,789,712	13,242,612	9,948,331	139,529,173	45,938,041
Exercise of Series E warrants											11,312
Exercise of Series E warrants, shares											51,681
Exercise of stock options	4,972	1	4,971
Exercise of stock options, shares	1,149	1,149
Share-based compensation expense	76,548		76,548
Accretion of redeemable convertible preferred stock issuance costs	(24,077)		(24,077)			220	576	1,056	1,451	12,441	8,333
Accretion of Series E warrant discount	(87,470)		(87,470)								87,470
Accretion of Series D and E redeemable convertible preferred stock dividend	(798,582)		(798,582)							600,072	198,510
Net loss	(4,088,134)				(4,088,134)
Balance at Mar. 31, 2015	$ (74,586,669)	$ 334	$ (2,255,166)	$ (75,000)	$ (72,256,837)	$ 1,402,907	$ 2,099,886	$ 4,568,581	$ 2,224,957	$ 37,787,179	$ 8,760,524
Balance, shares at Mar. 31, 2015		333,756
Balance, Redeemable convertible preferred stock shares at Mar. 31, 2015						1,292,084	6,789,712	13,242,612	9,948,331	139,529,173	45,989,722