Income taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Deferred tax assets:
Federal, state and foreign net operating losses	$ 38,569	$ 57,809
Federal and state tax credits	15,861	14,104
Stock-based compensation	2,442	2,885
Accrued expenses and reserves	24,973	13,659
Capitalized expense	0	34
Unrealized losses	282	481
Property and equipment	37	43
Operating lease liabilities	1,437	0
Acquired intangible assets	953	768
Total deferred tax assets	84,554	89,783
Deferred tax liabilities:
Property and equipment	(66)	(79)
Capitalized software	(17,579)	(17,848)
Deferred revenue	(14,777)	(22,486)
Unrealized gains	(25)	(236)
Operating lease right-of-use assets	(1,196)	0
Investments	(2,617)	0
Total deferred tax liabilities:	(36,260)	(40,649)
Deferred tax assets, net of liabilities:	48,294	49,134
Valuation allowance — worldwide	(46,804)	(48,370)
Net deferred tax assets	$ 1,490	$ 764