Income taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Deferred tax assets
Federal, state and foreign net operating losses	$ 4,324	$ 2,237
Federal and state tax credits	2,327	1,475
Stock-based compensation	3,867	3,107
Accrued expenses and reserves	5,826	6,309
Foreign tax credits	320	0
Capitalized expense	413	490
Unrealized losses on investments	54	0
Total deferred tax assets:	17,131	13,618
Deferred tax liabilities
Property and equipment	(1,808)	(2,527)
Capitalized software	(284)	(1,606)
Acquired intangible assets	(736)	(1,590)
Unrealized gains on investments	0	(344)
Total deferred tax liabilities:	(2,828)	(6,067)
Deferred tax assets, net of liabilities:	14,303	7,551
Valuation allowance - worldwide	(12,969)	(2,913)
Net deferred tax assets:	$ 1,334	$ 4,638