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

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Period Type:

Convertible Senior Notes - $335 million 0.00% Convertible Senior Notes due 2023 (Detail)	1 Months Ended		3 Months Ended				6 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($)	Jun. 30, 2018 USD ($) D $ / shares shares	Oct. 30, 2021 USD ($)	Jul. 31, 2021 USD ($) $ / shares shares	May 01, 2021 USD ($) shares	Aug. 01, 2020 USD ($)	Jul. 31, 2021 USD ($) $ / shares	Aug. 01, 2020 USD ($) shares	Feb. 01, 2020 USD ($)	Jan. 30, 2021 USD ($)
Debt default conditions
Debt amount settled in cash							$ 28,111,000	$ 215,846,000
(Gain) Loss on extinguishment of debt				$ (3,166,000)		$ 152,000	(3,271,000)	152,000	$ (3,166,000)
Trading days used to determine the conversion value				45 days
Amortization of debt discount							17,461,000	$ 25,378,000
Common Stock
Debt default conditions
Shares acquired from notes settlement \| shares								600
Convertible senior notes due 2023
Debt Instrument
Debt instrument, principal amount		$ 335,000,000		$ 301,819,000			$ 301,819,000			$ 335,000,000
Debt instrument, maturity date		Jun. 15, 2023
Debt default conditions
Events of default and acceleration of maturity description		Certain events are also considered “events of default” under the 2023 Notes, which may result in the acceleration of the maturity of the 2023 Notes, as described in the indenture governing the 2023 Notes. Events of default under the indenture for the 2023 Notes include, among other things, the occurrence of an event of default by us as defined under any mortgage, indenture or instrument under which there may be issued, or by which there may be secured or evidenced, any indebtedness of the Company or any of its significant subsidiaries for money borrowed, if that event of default (i) constitutes the failure to pay when due indebtedness in the aggregate principal amount in excess of $20 million and (ii) such event of default continues for a period of 30 days after written notice is delivered to the Company by the Trustee or to the Company and the Trustee by the holders of at least 25% of the aggregate principal amount of the 2023 Notes then outstanding.
Debt default, failure to pay due indebtedness, threshold amount		$ 20,000,000
Debt default, failure to pay due indebtedness, threshold period		30 days
Percentage of aggregate principal amount of notes outstanding		25.00%
Debt instrument, conversion description		The initial conversion rate applicable to the 2023 Notes is 5.1640 shares of common stock per $1,000 principal amount of 2023 Notes, which is equivalent to an initial conversion price of approximately $193.65 per share.
Debt instrument, initial conversion rate		100
Debt instrument, conversion principal amount		$ 1,000
Debt instrument, convertible earliest date		Mar. 15, 2023					Mar. 15, 2023
Deemed elected combination settlement amount per note to be received upon conversion		$ 1,000
Debt instrument, effective interest rate		6.35%
Aggregate principal amount, current				172,141,000			$ 172,141,000			2,354,000
Debt amount settled in cash	$ 2,400,000			$ 30,800,000	$ 2,400,000
Shares issued upon conversion \| shares				112,297	7,307
(Gain) Loss on extinguishment of debt				$ (3,200,000)	$ 100,000
Shares acquired from notes settlement \| shares				112,296
Convertible debt expected to be settled in cash and common stock				$ 173,500,000
Outstanding principal balance reclassified to current liabilities				173,500,000			173,500,000			173,500,000
Equity component reclassified to mezzanine equity from permanent equity				19,500,000			19,500,000			$ 19,500,000
Discounts upon original issuance		$ 1,700,000
Third party offering costs		$ 4,600,000
Amortization of debt issuance costs				300,000		300,000	500,000	$ 500,000
Amortization of debt discount				$ 4,600,000		$ 4,400,000	$ 9,200,000	$ 8,700,000
Convertible senior notes due 2023 \| Convertible debt instrument conversion period one
Debt default conditions
Debt instrument, convertible trading days \| D		20
Debt instrument, convertible consecutive trading days \| D		30
Debt instrument, convertible percentage of stock price		130.00%
Convertible senior notes due 2023 \| Convertible debt instrument conversion period two
Debt default conditions
Debt instrument, convertible trading days \| D		5
Debt instrument, convertible consecutive trading days \| D		10
Debt instrument, convertible percentage of stock price		98.00%
Convertible senior notes due 2023 \| Common Stock
Debt default conditions
Debt instrument, initial conversion rate		5.1640
Debt instrument, conversion principal amount		$ 1,000
Conversion price per share \| $ / shares		$ 193.65		$ 193.65			$ 193.65
Shares issued upon conversion \| shares		1,730,000
Convertible bond hedge and warrant transactions \| Convertible senior notes due 2023
Debt Instrument
Debt instrument, issuance date		Jun. 30, 2018
Debt default conditions
Shares issued upon conversion \| shares				1	2
Shares received upon exercise of warrants \| shares					7,305
Convertible bond hedge and warrant transactions \| Convertible senior notes due 2023 \| Common Stock
Debt default conditions
Conversion price per share \| $ / shares		$ 193.65
Private Offering \| Convertible senior notes due 2023
Debt Instrument
Debt instrument, issuance date		Jun. 30, 2018
Debt instrument, principal amount		$ 300,000,000
Debt instrument, interest rate		0.00%
Overallotment Option \| Convertible senior notes due 2023
Debt Instrument
Debt instrument, principal amount		$ 35,000,000
Scenario, Plan \| Convertible senior notes due 2023
Debt default conditions
Debt amount settled in cash			$ 173,500,000