Share-Based Compensation - Summary of Stock Option Activity under Stock Option Plans for Employees and Non-Executive Directors (Detail) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Number of Options
Exercised	(518)	0
Employees Information [Member]
Number of Options
Outstanding, Balance	237,000
Granted	36,000
Exercised	(1,000)
Expired/Forfeited	(65,000)
Outstanding, Balance	207,000
Exercisable, Balance	126,000
Expected to vest, Balance	64,000
Weighted Average Exercise Price
Outstanding, Balance	$ 20.43
Granted	2.97
Exercised	6.21
Expired/Forfeited	18.09
Outstanding, Balance	18.18
Exercisable, Balance	25.38
Expected to vest, Balance	$ 7.29
Weighted Average Remaining Contractual Life (Years)
Outstanding, Balance	6 years 29 days
Exercisable, Balance	3 years 5 months 16 days
Expected to vest, Balance	7 years 11 months 9 days
Aggregate Intrinsic Value
Outstanding December 31, 2015	$ 130
Exercisable, Balance	4
Expected to vest, Balance	$ 99
Non-Executive Director Information [Member]
Number of Options
Outstanding, Balance	243,000
Granted	186,000
Expired	(1,000)
Outstanding, Balance	427,000
Exercisable, Balance	413,000
Weighted Average Exercise Price
Outstanding, Balance	$ 5.58
Granted	3.24
Expired	54.00
Outstanding, Balance	4.41
Exercisable, Balance	$ 4.32
Weighted Average Remaining Contractual Life (Years)
Outstanding, Balance	8 years 2 months 27 days
Exercisable, Balance	8 years 2 months 5 days
Aggregate Intrinsic Value
Outstanding December 31, 2015	$ 1,151
Exercisable, Balance	$ 1,151