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Long-term Debt - Additional Information (Detail) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended
	Sep. 16, 2019 USD ($)	Mar. 26, 2019 USD ($)	Oct. 20, 2017 USD ($) Installment $ / shares shares	Oct. 19, 2017 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) d $ / shares	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Sep. 11, 2019 USD ($) CounterParty $ / shares
Debt Instrument [Line Items]
Amortization of debt discounts						$ 19
Premium paid for capped call transactions							$ 28,400
Loss on extinguishment of debt						$ 1,208
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			14,064,000
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%
Capped Call Transactions [Member]
Debt Instrument [Line Items]
Number of counterparties | CounterParty									2
Initial conversion price | $ / shares									$ 39.4625
Initial cap price | $ / shares									63.14
Sale price | $ / shares									$ 31.57
Convertible Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Principal amount					$ 220,000
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, 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 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
Debt interest expense					$ 3,900
Amortization of debt discounts					1,900
Accrued semi annual coupon payable					1,900
Amortization of debt issuance costs					100
Debt issuance costs gross					700
Long-term debt					$ 144,600			$ 142,600
Convertible Senior Notes Due 2026 [Member] | Liability Component [Member]
Debt Instrument [Line Items]
Debt issuance costs									4,700
Convertible Senior Notes Due 2026 [Member] | Equity Component [Member]
Debt Instrument [Line Items]
Debt issuance costs									$ 2,400
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
Convertible Senior Notes Due 2026 [Member] | Private Offering [Member]
Debt Instrument [Line Items]
Principal amount	$ 220,000
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				93,764,000
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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