Convertible Senior Notes - Notes Due 2023 (Detail)	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2018 USD ($) D	Jul. 29, 2023 shares	Jul. 30, 2022 USD ($) shares	Jul. 29, 2023 USD ($) shares	Jul. 30, 2022 USD ($) shares
Debt Instrument
Debt amount settled in cash | $					$ 1,696,000	$ 13,048,000
Shares acquired from notes settlement | shares			3,698,887	1,000,000
Common Stock
Debt Instrument
Shares acquired from notes settlement | shares			3,698,887	1,000,000	3,698,887	1,000,000
Private Offering
Debt Instrument
Debt instrument, principal amount | $		$ 300,000,000
2023 Notes
Debt Instrument
Debt amount settled in cash | $	$ 1,700,000					$ 9,400,000
Shares issued upon conversion | shares					1,931
Debt instrument, principal amount | $	$ 1,700,000			$ 9,400,000		$ 9,400,000
Debt instrument, convertible earliest date		Mar. 15, 2023
2023 Notes | Common Stock
Debt Instrument
Shares issued upon conversion | shares						27,214
2023 Notes | Convertible note bond hedges | Common Stock
Debt Instrument
Shares issued upon conversion | shares						6
Shares acquired from notes settlement | shares						27,208
2023 Notes | Private Offering
Debt Instrument
Debt instrument, principal amount | $		$ 335,000,000
Debt instrument, interest rate		0.00%
2023 Notes | Circumstances (1)
Debt Instrument
Debt instrument, convertible trading days | D		20
Debt instrument, convertible consecutive trading days | D		30
Debt instrument, convertible percentage of stock price		130.00%
2023 Notes | Circumstances (2)
Debt Instrument
Debt instrument, convertible trading days | D		5
Debt instrument, convertible consecutive trading days | D		10
Debt instrument, convertible percentage of stock price		98.00%
Debt instrument, conversion principal amount | $		$ 1,000