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Financial Instruments - Summary of Valuation of Short-term Investments and Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, current	$ 2.1	$ 2.5
Marketable securities, noncurrent	6.2	4.8
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, noncurrent	1.3	1.6
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities, current	2.1	2.5
Marketable securities, noncurrent	$ 4.9	$ 3.2

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Amount of investment in marketable security, classified as current.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

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Amount of investment in marketable security, classified as noncurrent.

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