Stockholders' Deficit (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Sep. 30, 2014		Jun. 30, 2014	Mar. 31, 2014
Shareholders Deficit [Line Items]
Class Of Warrant Or Right Outstanding			25,581	20,116
Number of Warrants - warrants issued in connection with conversion of Cognate accounts payable	1,121		364	741
Number Of Warrants - Warrants issued for services	17			2,434	[1]
Number of Warrants - warrants issued in connection with common stock issued			281	150
Number Of Warrants - Warrants issued to Cognate for services	2,326
Number Of Warrants Warrants - Exercised On Cashless Basis				(73)
Number Of Warrants Warrants - Exercised For Cash	(497)		(90)	(722)
Number of Warrants - warrants issued in connection with registered direct offering			2,273
Number of Warrants - warrants issued to placement agent in connection with registered direct offering			113
Number of Warrants - Expired	(1)			(6)
Class Of Warrant Or Right Outstanding	28,962	[2]		25,581
Weighted Average Exercise Price - Outstanding			$ 5.32	$ 5.23
Weighted Average Exercise Price - warrants issued in connection with conversion of Cognate accounts payable	$ 4.00		$ 4.00	$ 4.00
Weighted Average Exercise Price - warrants issued in exchange for services	$ 6.33			$ 4.00	[1]
Weighted Average Exercise Price - warrants issued in connection with common stock issued			$ 4.00	$ 5.00
Weighted Average Exercise Price - Warrants issued to Cognate for services	$ 4.00
Weighted Average Exercise Price - exercised for cash	$ 3.48		$ 4.25	$ 3.66
Weighted average exercise Price - Warrants exercised on a cashless basis				$ 0
Weighted Average Exercise Price - warrants issued in connection with registered direct offering			$ 7.50
Weighted Average Exercise Price - warrants issued to placement agent in connection with registered direct offering			$ 8.25
Weighted Average Exercise Price - Expired	$ 7.63			$ 9.54
Weighted Average Exercise Price - Outstanding	$ 4.90	[2]		$ 5.32

[1] The warrants contain "down round protection" and the Company classifies these warrant instruments as liabilities measured at fair value and re-measures these instruments at fair value each reporting period.

[2] Approximately 9,614,470 warrants issued to Cognate, during the six year period from 2008 through 2014, with a weighted average exercise price and remaining contractual term of $3.00 and 3.8 years, respectively. The weighted average exercise price gives effect to adjustments related to the most favored nation clause that occurred during the period.