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Convertible Notes - Additional Information (Detail) $ in Thousands					3 Months Ended		9 Months Ended
	Jun. 14, 2021 USD ($) shares Day	Jan. 01, 2021 USD ($)	Aug. 13, 2020 USD ($) shares Day	Jun. 16, 2020 USD ($) shares Day	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Convertible Senior Notes [Line Items]
Convertible senior notes face value					$ 325,000		$ 325,000		$ 175,000
Implementation of ASU 2020-06 [Member]
Convertible Senior Notes [Line Items]
Reduction of unamortized discount upon implementation of ASU 2020-06		$ 4,207
Increase in unamortized issuance costs upon implementation of ASU 2020-06		$ 119
Accounts Payable and Accrued Liabilities [Member]
Convertible Senior Notes [Line Items]
Interest payable					3,674		$ 3,674		$ 2,173
Convertible Senior Notes Due Two Thousand And Twenty Three [Member]
Convertible Senior Notes [Line Items]
Convertible senior notes face value			$ 25,000	$ 150,000
Convertible senior notes stated rate of interest			4.25%	4.25%
Covertible senior notes year of maturity			2023	2023
Maximum Conversion Rate			270.2702	270.2702
Former Credit Facility [Member]
Convertible Senior Notes [Line Items]
Interest expense						$ 2,511		$ 2,888
Convertible Senior Notes Due Two Thousand And Twenty Six [Member]
Convertible Senior Notes [Line Items]
Convertible senior notes face value	$ 150,000
Convertible senior notes stated rate of interest	3.25%
Covertible senior notes year of maturity	2026
Maximum Conversion Rate	144.9275
Convertible Senior Notes [Member]
Convertible Senior Notes [Line Items]
Convertible debt instrument terms of conversion	Conversion price: Convertible at an initial conversion rate of the Company’s common stock, per $1,000 principal amount of notes (equivalent to an initial conversion price as disclosed in the table above).		Conversion price: Convertible at an initial conversion rate of the Company’s common stock, per $1,000 principal amount of notes (equivalent to an initial conversion price as disclosed in the table above).	Conversion price: Convertible at an initial conversion rate of the Company’s common stock, per $1,000 principal amount of notes (equivalent to an initial conversion price as disclosed in the table above).			Conversion: Holders may convert at their option at any time prior to the close of business on the business day immediately preceding March 15, 2026 and March 15, 2023 in respect of the 2021 Notes and 2020 Notes, respectively, only under the following circumstances: (i) if the last reported sale price of the Company’s common stock for at least 20 trading days during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (ii) during the five business day period after any ten consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of the Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sales price of the Company’s common stock and the conversion rate on each such trading day; (iii) upon a notice of redemption delivered by the Company in accordance with the terms of the indentures but only with respect to the Convertible Notes called (or deemed called) for redemption; or (iv) upon the occurrence of specified corporate events. On or after March 15, 2026 and March 15, 2023 in respect of the 2021 Notes and 2020 Notes, respectively, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances.
Redemption provisions - Convertible notes			Redemption price: The Company may redeem for cash all or any portion of the notes, at its option, on or after June 20, 2026 and June 20, 2023 in respect of the 2021 Notes and 2020 Notes, respectively, and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes.	Redemption price: The Company may redeem for cash all or any portion of the notes, at its option, on or after June 20, 2026 and June 20, 2023 in respect of the 2021 Notes and 2020 Notes, respectively, and on or prior to the 55th scheduled trading day immediately preceding the maturity date, if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days, including the trading day immediately preceding the date on which the Company provides notice of redemption, during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding the redemption date. No sinking fund is provided for the Convertible Notes.
Redemption provisions - Convertible notes, threshold trading days | Day	20		20	20
Redemption provisions - Convertible notes, threshold consecutive trading days | Day	30		30	30
Redemption provisions - Convertible notes redemption price as a percentage of principal amount accrued interest and unpaid interest	100.00%		100.00%	100.00%
Maximum number of shares issuable upon conversion | shares	69,036,410		69,036,410	69,036,410
Minimum percentage of lenders required to have entire principal amount of convertible notes repurchased by the Company upon certain events of default	25.00%		25.00%	25.00%
Interest expense					3,729		$ 8,592
Number Of Threshold Trading Days For Determining The Share Price	5 days		5 days	5 days
Measurement period for determining share price	10 days		10 days	10 days
Share price as a percentage of last reported price and conversion rate	98.00%		98.00%	98.00%
Convertible Senior Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Convertible Senior Notes [Line Items]
Fair Value of Convertible Notes					$ 350,331		$ 350,331

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