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Income Taxes - Schedule of Differences Between Statutory Federal Income Tax Rate and Income Taxes Reported in Consolidated Statements of Operations (Detail) - USD ($) $ in Millions	3 Months Ended												6 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2017	[1]	Sep. 30, 2017	[1]	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2017
Income Tax Disclosure [Abstract]
Federal income tax expense at the statutory rate													21.00%	35.00%	21.00%	28.10%		35.00%
State income taxes, net of federal benefit															6422.10%	2.40%		1.90%
Research and development credits, net of the federal tax on state credits															(11880.90%)	(1.70%)		(8.50%)
Uncertain tax positions, net of federal benefit															9312.10%	2.10%		3.30%
Uncertain tax benefits statute expired, net of federal benefit															(22798.50%)	0.00%		0.00%
Incentive stock option and employee stock purchase plan expense															(9954.30%)	(1.40%)		10.90%
Foreign rate differential															2568.80%	(0.70%)		(1.50%)
Change in valuation allowance															(642.20%)	0.50%		8.30%
Tax Cut and Jobs Act Impact															0.00%	(26.60%)		0.00%
Fair value adjustments related to acquisition contingent consideration															2568.80%	(14.20%)		2.10%
Non-deductible meals and entertainment															4174.40%	0.30%		1.60%
Non-deductible officer compensation															1926.60%	0.00%		0.00%
Non-deductible legal settlement															6101.00%	0.00%		0.00%
Foreign disregarded election															20550.80%	0.00%		0.00%
Changes in revenue recognition/method															(23440.80%)	0.00%		0.00%
Other, net															963.40%	0.50%		(0.70%)
Effective income tax rate															(14107.70%)	(10.70%)		52.40%
Federal income tax expense at the statutory rate															$ 0.0	$ 33.7		$ 12.7
State income taxes, net of federal benefit															2.0	2.9		0.7
Research and development credits, net of the federal tax on state credits															(3.7)	(2.1)		(3.1)
Uncertain tax positions, net of federal benefit															2.9	2.5		1.2
Uncertain tax benefits statute expired, net of federal benefit															(7.1)
Incentive stock option and employee stock purchase plan expense															(3.1)	(1.7)		4.0
Foreign rate differential															0.8	(0.8)		(0.5)
Change in valuation allowance															(0.2)	0.6		3.0
Tax Cut and Jobs Act Impact																(32.0)
Fair value adjustments related to acquisition contingent consideration															0.8	(17.0)		0.8
Non-deductible meals and entertainment															1.3	0.4		0.6
Non-deductible officer compensation															0.6
Non-deductible legal settlement															1.9
Foreign disregarded election															6.4
Changes in revenue recognition/method															(7.3)
Other, net															0.3	0.5		(0.4)
Total income tax expense (benefit)	$ (3.4)	$ (3.6)	$ 1.0	$ 1.6	$ 3.5		$ 4.3		$ (25.3)		$ 4.5				$ (4.4)	$ (13.0)	[1]	$ 19.0	[1]
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements of this report for additional information.

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