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Debt - January 2017 Exchangeable Senior Notes - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Jan. 20, 2017	Oct. 31, 2018	Dec. 31, 2018	Dec. 31, 2019
Debt Disclosure [Line Items]
Convertible senior notes, exchanged			$ 29,490,000
Convertible Debt | 2017 Notes
Debt Disclosure [Line Items]
Convertible senior notes, principal amount	$ 30,000,000.0
Convertible senior notes, exchanged		$ 30,000,000.0
Convertible senior notes, stated interest rate	3.50%
Convertible senior notes, due date	2047
Convertible senior notes, repurchase price at option of the issuer	100.00%
Convertible senior notes, outstanding amount				$ 0

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Debt disclosure.

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The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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