Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2012
Numerator
Net loss	$ (9,628)		$ (9,712)		$ (8,658)		$ (7,292)		$ (6,841)		$ (6,219)		$ (5,767)		$ (5,210)		$ (35,290)		$ (24,037)		$ (16,790)
Denominator
Weighted average common shares - basic (in shares)																	28,295,758		21,685,932		18,035,635
Effect of dilutive stock options and warrants (in shares)																	0	[1],[2],[3]	0	[1],[2],[3]	0	[1],[2],[3]
Weighted average common shares outstanding - diluted (in shares)																	28,295,758		21,685,932		18,035,635
Net loss per common share - basic and diluted (in usd per share)	$ (0.31)	[4]	$ (0.32)	[4]	$ (0.32)	[4]	$ (0.29)	[4]	$ (0.28)	[4]	$ (0.29)	[4]	$ (0.28)	[4]	$ (0.26)	[4]	$ (1.25)	[4]	$ (1.11)	[4]	$ (0.93)

[1] At June 30, 2014, 2013, and 2012; 0, 2,091,718, and 2,457,433, warrants, respectively, were outstanding. The effect of the shares that would be issued upon exercise of these warrants has been excluded from the calculation of diluted loss per share, because those shares are anti-dilutive.

[2] At June 30, 2014, 2013, and 2012; 922,809, 1,739,663, and 2,371,198 stock options, respectively, were outstanding. The effect of the shares that would be issued upon exercise of these options has been excluded from the calculation of diluted loss per share, because those shares are anti-dilutive.

[3] At June 30, 2014, 2013, and 2012; 0, 321,099 and 363,794 additional shares of common stock were issuable upon the conversion of outstanding convertible debt agreements. The effect of the shares that would be issued upon conversion of these debt agreements has been excluded from the calculation of diluted loss per share because those shares are anti-dilutive.

[4] The summation of quarterly per share data may not equate to the calculation for the full fiscal year as quarterly calculations are performed on a discrete basis.