Share-Based Compensation - Summary of Stock Option Activity under Stock Option Plans for Employees and Non-Executive Directors (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Employees Information [Member]
Number of Options
Outstanding, Balance | shares	2,131
Granted | shares	300
Expired/Forfeited | shares	(322)
Outstanding, Balance | shares	2,109
Exercisable, Balance | shares	1,160
Expected to vest, Balance | shares	743
Weighted Average Exercise Price
Outstanding, Balance	$ 2.27
Granted	0.30
Expired/Forfeited	1.58
Outstanding, Balance	2.09
Exercisable, Balance	2.80
Expected to vest, Balance	$ 1.26
Weighted Average Remaining Contractual Life (Years)
Outstanding, Balance	6 years 1 month 28 days
Exercisable, Balance	3 years 6 months 29 days
Expected to vest, Balance	7 years 8 months 5 days
Aggregate Intrinsic Value
Outstanding September 30, 2015 | $	$ 1
Exercisable, Balance | $	0
Expected to vest, Balance | $	$ 0
Non-Executive Director Information [Member]
Number of Options
Outstanding, Balance | shares	2,185
Granted | shares	1,293
Expired | shares	(10)
Outstanding, Balance | shares	3,468
Weighted Average Exercise Price
Outstanding, Balance	$ 0.62
Granted	0.27
Expired	6.00
Outstanding, Balance	$ 0.48
Weighted Average Remaining Contractual Life (Years)
Outstanding, Balance	8 years 3 months 22 days
Aggregate Intrinsic Value
Outstanding September 30, 2015 | $	$ 97