Share-Based Compensation - Summary of Stock Option Activity under Stock Option Plans for Employees and Non-Executive Directors (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Dec. 31, 2014
Employees Information [Member]
Number of Options
Outstanding, Balance	2,619
Granted	715
Expired/forfeited	(409)
Outstanding, Balance	2,925
Exercisable, Balance	1,406
Expected to vest, Balance	1,189
Weighted Average Exercise Price
Outstanding, Balance	$ 3.59
Granted	$ 0.84
Expired/forfeited	$ 7.57
Outstanding, Balance	$ 2.36
Exercisable, Balance	$ 3.51
Expected to vest, Balance	$ 1.29
Weighted Average Remaining Contractual Life (Years)
Outstanding, Balance	6 years 8 months 5 days
Exercisable, Balance	4 years 4 months 17 days
Expected to vest, Balance	8 years 1 month 17 days
Aggregate Intrinsic Value
Outstanding, Balance	$ 150
Exercisable, Balance	21
Expected to vest, Balance	23
Non-Executive Director Information [Member]
Number of Options
Outstanding, Balance	742
Granted	342
Expired	(10)
Outstanding, Balance	1,074
Weighted Average Exercise Price
Outstanding, Balance	$ 1.39
Granted	$ 0.79
Expired	$ 14.30
Outstanding, Balance	$ 1.08
Weighted Average Remaining Contractual Life (Years)
Outstanding, Balance	6 years 6 months 7 days
Aggregate Intrinsic Value
Outstanding, Balance	$ 94