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Long-term Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands						3 Months Ended		9 Months Ended
	May 12, 2020 USD ($)	Sep. 16, 2019 USD ($)	Mar. 26, 2019 USD ($)	Oct. 20, 2017 USD ($) Installment $ / shares shares	Oct. 19, 2017 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) d $ / shares	Sep. 30, 2019 USD ($)	May 06, 2020 CounterParty $ / shares	Dec. 31, 2019 USD ($)	Sep. 11, 2019 USD ($) CounterParty $ / shares
Debt Instrument [Line Items]
Amortization of debt discounts									$ 51
Loss on extinguishment of debt							$ 293		$ 1,501
Term Loan Facility [Member]
Debt Instrument [Line Items]
Principal amount			$ 21,700
Final payment due amount			21,800
Debt instrument per diem interest amount			$ 100
Final payment percentage equal to original principal amount			8.00%
Final payment towards original principal amount			$ 1,600
Prepayment fee			100
Loss on extinguishment of debt			$ 1,200
Silicon Valley Bank [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Warrant to purchase common stock | shares				14,064
Exercise price per share | $ / shares				$ 5.484
Warrant term				10 years
Aggregate purchase price				$ 250
Loan and Security Agreement [Member] | Silicon Valley Bank [Member]
Debt Instrument [Line Items]
Debt instrument, due and payment description								the Company was required to make monthly interest-only payments through November 1, 2019 and was required to make 24 equal monthly payments of principal, plus accrued interest, from November 1, 2019 through October 1, 2021, when all unpaid principal and interest became due and payable
Term loan facility				$ 20,000
Loan and Security Agreement [Member] | Silicon Valley Bank [Member] | Convertible Preferred Stock [Member]
Debt Instrument [Line Items]
Debt instrument, number of equal monthly installments | Installment				24
Loan and Security Agreement [Member] | Silicon Valley Bank [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Interest bear rate				1.50%
2019 Convertible Notes [Member]
Debt Instrument [Line Items]
Premium paid for capped call transactions								$ 28,400
2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Premium paid for capped call transactions								43,100
Capped Call Transactions [Member]
Debt Instrument [Line Items]
Number of counterparties | CounterParty										2		2
Initial conversion price | $ / shares										$ 39.4625		$ 39.4625
Initial cap price | $ / shares												$ 63.14
Convertible Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Principal amount						$ 353,800		$ 353,800
Debt instrument, stated percentage		3.50%
Debt instrument, due and payment description								The Convertible Notes are senior unsecured obligations of the Company and bear interest at a rate of 3.5% per year payable semiannually in arrears on March 15 and September 15 of each year, beginning on March 15, 2020.
Debt instrument, frequency of periodic payment								semiannually
Maturity date		Sep. 15, 2026
Redemption period, start date								Sep. 20, 2023
Threshold percentage of stock price trigger								130.00%
Threshold trading days | d								20
Threshold consecutive trading days | d								30
Redemption price, percentage								100.00%
Debt interest expense						9,500		$ 20,300
Amortization of debt discounts						4,800		10,100
Accrued semi annual coupon payable						4,600		9,800
Amortization of debt issuance costs						100		400
Debt issuance costs gross						8,000		8,000
Long-term debt						$ 353,800		$ 353,800			$ 142,600
Convertible Senior Notes Due 2026 [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Terms of conversion								The Convertible Notes are convertible into shares of the Company’s common stock at an initial conversion rate of 25.3405 shares per $1,000 principal amount of Convertible Notes (equivalent to an initial conversion price of approximately $39.46 per share of common stock).
Conversion ratio								0.0253405
Conversion price | $ / shares						$ 39.46		$ 39.46
Convertible Senior Notes Due 2026 [Member] | 2019 Convertible Notes [Member]
Debt Instrument [Line Items]
Net proceeds from the sale of the notes		$ 212,900
Payment of convertible debt discounts and commissions		6,600
Payment of convertible debt offering expenses		500
Payments of transactions cost		$ 28,400
Debt instrument, stated percentage		3.50%
Debt instrument effective interest rate												10.50%
Debt instrument convertible carrying amount of liability component												$ 145,100
Debt discount												74,900
Debt issuance costs												7,100
Convertible Senior Notes Due 2026 [Member] | 2019 Convertible Notes [Member] | Liability Component [Member]
Debt Instrument [Line Items]
Debt issuance costs												4,700
Convertible Senior Notes Due 2026 [Member] | 2019 Convertible Notes [Member] | Equity Component [Member]
Debt Instrument [Line Items]
Debt issuance costs												$ 2,400
Convertible Senior Notes Due 2026 [Member] | 2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Net proceeds from the sale of the notes	$ 322,900
Payment of convertible debt discounts and commissions	5,700
Payment of convertible debt offering expenses	300
Payments of transactions cost	$ 43,100
Debt instrument effective interest rate	10.50%
Debt instrument convertible carrying amount of liability component	$ 204,500
Debt discount	95,500
Debt issuance costs	6,000
Convertible Senior Notes Due 2026 [Member] | 2020 Convertible Notes [Member] | Liability Component [Member]
Debt Instrument [Line Items]
Debt issuance costs	3,700
Convertible Senior Notes Due 2026 [Member] | 2020 Convertible Notes [Member] | Equity Component [Member]
Debt Instrument [Line Items]
Debt issuance costs	2,300
Convertible Senior Notes Due 2026 [Member] | Private Offering [Member] | 2019 Convertible Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 220,000
Convertible Senior Notes Due 2026 [Member] | Private Offering [Member] | 2020 Convertible Notes [Member]
Debt Instrument [Line Items]
Principal amount	$ 300,000
Unsecured Promissory Note [Member] | Golda Darty Partners S A [Member]
Debt Instrument [Line Items]
Principal amount		7,000			$ 7,000
Debt instrument, due and payment description								The promissory note accrued interest at a rate per annum of 8.0%, and was due and payable quarterly in arrears on the 19th day of each April, July, October and January.
Maturity date					Oct. 19, 2022
Long-term debt					$ 7,000
Debt instrument per diem interest amount		100
Loss on extinguishment of debt					$ 300
Warrant to purchase common stock | shares					93,764
Exercise price per share | $ / shares					$ 5.484
Accrued interest rate					8.00%
Repayment of related party due amount including diem interest		$ 7,100
Fair value of warrant					$ 400

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