Balance sheet information - Intangibles and Other Accrued Expenses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Balance Sheet Related Disclosures [Abstract]
Goodwill	$ 31,300,000		$ 31,300,000		$ 31,300,000
Acquired developed technology	13,875,000		13,875,000		13,875,000
Less accumulated amortization	(9,728,000)		(9,728,000)		(9,210,000)
Intangible assets, net	4,147,000		4,147,000		4,665,000
Amortization of Intangible Assets	258,000	$ 307,000	518,000	$ 1,016,000
Accrued Liabilities, Current [Abstract]
Accrued compensation and benefits	9,431,000		9,431,000		9,308,000
Accrued royalties	14,408,000		14,408,000		15,331,000
Accrued legal settlement and contingencies	7,274,000		7,274,000		1,576,000
Other accrued expenses	10,261,000		10,261,000		10,059,000
Accrued expenses	41,374,000		41,374,000		$ 36,274,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2017	513,000		513,000
2018	1,000,000		1,000,000
2019	1,000,000		1,000,000
2020	1,000,000		1,000,000
2021	$ 592,000		$ 592,000