Summary of business and significant accounting policies - Adopted Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended									12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018		Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2017
Assets
Deferred costs	$ 18,752				$ 11,759	[1]				$ 18,752		$ 11,759	[1]
Deferred costs, non-current	61,050				46,666	[1]				61,050		46,666	[1]
Total assets	297,015				237,680	[1]				297,015		237,680	[1]
Liabilities and stockholders’ equity
Deferred revenue	31,270				20,714	[1]				31,270		20,714	[1]
Deferred revenue, non-current	103,865				53,824	[1]				103,865		53,824	[1]
Accumulated deficit	(90,279)				(57,202)	[1]				(90,279)		(57,202)	[1]
Total liabilities and stockholders’ equity	297,015				237,680	[1]				297,015		237,680	[1]
Revenue:
Total revenue	58,452	$ 53,069	$ 57,176	$ 52,199	55,987		$ 46,382	$ 61,399	$ 54,695	220,896		218,463	[1]	$ 209,715	[1]
Cost of revenue:
Total cost of revenue										124,675		128,071	[1]	120,436	[1]
Gross profit	26,357	23,442	24,985	21,437	24,164		21,715	23,523	20,990	96,221		90,392	[1]	89,279	[1]
Operating expenses:
Research and development										83,953		85,646	[1]	67,406	[1]
Total operating expenses										130,342		131,047	[1]	118,866	[1]
Loss from operations										(34,121)		(40,655)	[1]	(29,587)	[1]
Net loss	$ (12,856)	$ (7,481)	$ (4,581)	$ (7,570)	$ (7,465)		$ (14,457)	$ (8,394)	$ (10,518)	$ (32,488)	[2]	$ (40,834)	[1],[2]	$ (29,536)	[1],[2]
Net loss per share, basic and diluted (in dollars per share)	$ (0.28)	$ (0.16)	$ (0.10)	$ (0.17)	$ (0.17)		$ (0.32)	$ (0.19)	$ (0.24)	$ (0.71)		$ (0.92)	[1]	$ (0.68)	[1]
As Reported
Assets
Deferred costs					$ 31,888							$ 31,888
Deferred costs, non-current					109,269							109,269
Total assets					320,412							320,412
Liabilities and stockholders’ equity
Deferred revenue					52,871							52,871
Deferred revenue, non-current					182,236							182,236
Accumulated deficit					(135,042)							(135,042)
Total liabilities and stockholders’ equity					320,412							320,412
Revenue:
Total revenue												106,180		$ 169,584
Cost of revenue:
Total cost of revenue												62,230		92,335
Gross profit												43,950		77,249
Operating expenses:
Research and development												87,488		73,102
Total operating expenses												132,889		124,562
Loss from operations												(88,939)		(47,313)
Net loss												$ (89,118)		$ (47,262)
Net loss per share, basic and diluted (in dollars per share)												$ (2.00)		$ (1.09)
Product
Revenue:
Total revenue										$ 168,619		$ 163,599	[1]	$ 155,025	[1]
Cost of revenue:
Total cost of revenue										97,245		102,224	[1]	98,531	[1]
Product | As Reported
Revenue:
Total revenue												59,143		119,785
Cost of revenue:
Total cost of revenue												37,517		70,260
Services
Revenue:
Total revenue										52,277		54,864	[1]	54,690	[1]
Cost of revenue:
Total cost of revenue										$ 27,430		25,847	[1]	21,905	[1]
Services | As Reported
Revenue:
Total revenue												47,037		49,799
Cost of revenue:
Total cost of revenue												24,713		22,075
Accounting Standards Update 2014-09 | Adjustments
Assets
Deferred costs					(20,129)							(20,129)
Deferred costs, non-current					(62,603)							(62,603)
Total assets					(82,732)							(82,732)
Liabilities and stockholders’ equity
Deferred revenue					(32,157)							(32,157)
Deferred revenue, non-current					(128,412)							(128,412)
Accumulated deficit					77,840							77,840
Total liabilities and stockholders’ equity					$ (82,732)							(82,732)
Revenue:
Total revenue												112,283		40,131
Cost of revenue:
Total cost of revenue												65,841		28,101
Gross profit												46,442		12,030
Operating expenses:
Research and development												(1,842)		(5,696)
Total operating expenses												(1,842)		(5,696)
Loss from operations												48,284		17,726
Net loss												$ 48,284		$ 17,726
Net loss per share, basic and diluted (in dollars per share)												$ 1.08		$ 0.41
Accounting Standards Update 2014-09 | Product | Adjustments
Revenue:
Total revenue												$ 104,456		$ 35,240
Cost of revenue:
Total cost of revenue												64,707		28,271
Accounting Standards Update 2014-09 | Services | Adjustments
Revenue:
Total revenue												7,827		4,891
Cost of revenue:
Total cost of revenue												$ 1,134		$ (170)

[1] See Note 1 for a summary of adjustments.

[2] See Note 1 for a summary of adjustments. The cumulative effect adjustment to Accumulated Deficit and Total Stockholders' Equity related to the adoption of ASU No. 2014-09 (Topic 606) as of June 30, 2016 was $11.8 million.