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Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended			3 Months Ended
	Mar. 31, 2020	Aug. 31, 2018	May 31, 2018	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Obligation expiration year				2021
Loss on strategic investment				$ 1,497,000	$ 229,000
Restricted cash	$ 5,770,000			5,770,000	4,787,000		$ 4,787,000	$ 4,826,000
Letter of Credit | Corporate Credit Card Program
Other Commitments [Line Items]
Restricted cash	2,000,000.0			2,000,000.0
Letter of Credit | Fleet Program
Other Commitments [Line Items]
Restricted cash	400,000			400,000
Other assets
Other Commitments [Line Items]
Aggregate carrying amount of strategic equity investment	800,000			800,000			$ 2,300,000
Other expense
Other Commitments [Line Items]
Loss on strategic investment				1,500,000	$ 200,000
Exclusivity Deed | Neuren
Other Commitments [Line Items]
Aggregate carrying amount of strategic equity investment			$ 3,100,000
Shares subscribed			1,330,000
Exclusivity Deed | Neuren | Selling, general and administrative
Other Commitments [Line Items]
Payments for exclusive right			$ 900,000
License Agreements | Neuren | North America
Other Commitments [Line Items]
Upfront license fee	10,000,000.0	$ 10,000,000.0
License Agreements | Neuren | Research and development | North America
Other Commitments [Line Items]
Upfront payment				$ 10,000,000.0		$ 10,000,000.0
Maximum
Other Commitments [Line Items]
Percentage of royalty payments obligation on net product sales				2.00%
Maximum | License Agreements | Neuren | North America
Other Commitments [Line Items]
Additional milestone payments payable	$ 515,000,000.0	$ 455,000,000.0		$ 515,000,000.0

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