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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
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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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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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