Financial Instruments - Investment (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) position	Mar. 31, 2017 USD ($) position	Jun. 30, 2016 USD ($) position
Cash, cash equivalents and short-term investments
Amortized Cost	$ 84,167	$ 84,167	$ 167,025
Gross Unrealized Gains			8
Gross Unrealized Losses	(91)	(91)	(23)
Cash and Cash Equivalents	60,170	60,170	119,771
Short-term Investments	23,906	23,906	47,239
Other-than-temporary impairments	0	0	0
Amortized Cost
Due in 1 year or less	9,000	9,000
Due in 1-2 years	14,997	14,997
Total Amortized Cost	23,997	23,997
Estimated Fair Value
Due in 1 year or less	8,983	8,983
Due in 1-2 years	14,923	14,923
Available-for-sale Securities	23,906	23,906
Gross Unrealized Losses
Less Than 12 Months		(86)	(3)
12 Months or Greater		(5)	(20)
Total		(91)	(23)
Estimated Fair Value
Less Than 12 Months	20,912	20,912	6,325
12 Months or Greater	2,994	2,994	23,148
Total	$ 23,906	$ 23,906	$ 29,473
Number of positions held in an unrealized loss position | position	8	8	11
U.S. government agency securities
Gross Unrealized Losses
Less Than 12 Months		$ (86)
12 Months or Greater		(5)	$ (17)
Total		(91)	(17)
Estimated Fair Value
Less Than 12 Months	$ 20,912	20,912
12 Months or Greater	2,994	2,994	19,988
Total	23,906	23,906	19,988
Corporate debt securities
Gross Unrealized Losses
Less Than 12 Months			(3)
12 Months or Greater			(3)
Total			(6)
Estimated Fair Value
Less Than 12 Months			6,325
12 Months or Greater			3,160
Total			9,485
Cash
Cash, cash equivalents and short-term investments
Amortized Cost	58,669	58,669	95,906
Cash and Cash Equivalents	58,669	58,669	95,906
Level 1
Cash, cash equivalents and short-term investments
Amortized Cost			13,362
Cash and Cash Equivalents			13,362
Level 1 | Money market funds
Cash, cash equivalents and short-term investments
Amortized Cost	1,501	1,501	13,362
Cash and Cash Equivalents	1,501	1,501	13,362
Level 2
Cash, cash equivalents and short-term investments
Amortized Cost			57,757
Gross Unrealized Gains			8
Gross Unrealized Losses			(23)
Cash and Cash Equivalents			10,503
Short-term Investments			47,239
Level 2 | Commercial paper
Cash, cash equivalents and short-term investments
Amortized Cost			14,704
Cash and Cash Equivalents			8,938
Short-term Investments			5,766
Level 2 | U.S. government agency securities
Cash, cash equivalents and short-term investments
Amortized Cost	23,997	23,997	28,000
Gross Unrealized Gains			7
Gross Unrealized Losses	(91)	(91)	(17)
Short-term Investments	$ 23,906	$ 23,906	27,990
Level 2 | U.S. treasury securities
Cash, cash equivalents and short-term investments
Amortized Cost			3,997
Gross Unrealized Gains			1
Short-term Investments			3,998
Level 2 | Municipal debt securities
Cash, cash equivalents and short-term investments
Amortized Cost			1,565
Cash and Cash Equivalents			1,565
Level 2 | Corporate debt securities
Cash, cash equivalents and short-term investments
Amortized Cost			9,491
Gross Unrealized Losses			(6)
Short-term Investments			$ 9,485