Quarterly Financial Data - Schedule of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013 Fourth Quarter [Member]	Jun. 30, 2012 Fourth Quarter [Member]	Jun. 30, 2011 Fourth Quarter [Member]	Mar. 31, 2013 Third Quarter [Member]	Mar. 31, 2012 Third Quarter [Member]	Mar. 31, 2011 Third Quarter [Member]	Dec. 31, 2012 Second Quarter [Member]	Dec. 31, 2011 Second Quarter [Member]	Dec. 31, 2010 Second Quarter [Member]	Sep. 30, 2012 First Quarter [Member]	Sep. 30, 2011 First Quarter [Member]	Sep. 30, 2010 First Quarter [Member]
Continuing operations:
Revenues	$ 4,827	$ 3,188	$ 2,936	$ 1,445	$ 1,012	$ 779	$ 1,410	$ 764	$ 729	$ 1,051	$ 661	$ 723	$ 921	$ 751	$ 705
Operating expenses	12,198	10,895	10,087	3,082	3,218	2,719	3,268	2,684	2,432	2,960	2,327	2,455	2,888	2,666	2,481
Loss	(7,371)	(7,707)	(7,151)	(3,431)	(2,755)	(1,940)	(2,670)	(2,018)	(1,703)	(2,733)	(1,664)	(1,732)	(2,515)	(1,915)	(1,411)
Net loss	$ (11,349)	$ (8,352)	$ (12,555)	$ (3,431)	$ (2,755)	$ (2,062)	$ (2,670)	$ (2,018)	$ (1,621)	$ (2,733)	$ (1,664)	$ (7,275)	$ (2,515)	$ (1,915)	$ (1,597)
Loss per share	$ (0.45)	$ (0.35)	$ (0.59)	$ (0.12)	$ (0.13)	$ (0.11)	$ (0.11)	$ (0.08)	$ (0.08)	$ (0.11)	$ (0.06)	$ (0.32)	$ (0.11)	$ (0.08)	$ (0.08)