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

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Fair Value of Financial Instruments - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in notes		$ 66,122	$ 54,541
Equity Securities without Readily Determinable Fair Value, Amount			$ 5,000
Convertible debt investment \| Shorelight Holdings LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in notes	$ 13,000			$ 27,900
Debt Instrument, Interest Rate, Stated Percentage	1.69%
Debt Instrument, Maturity Date	Jan. 17, 2024	Jan. 17, 2024
Measurement Input, Discount Rate [Member] \| Convertible debt investment \| Shorelight Holdings LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input		0.240
Measurement Input, Price Volatility [Member] \| Convertible debt investment \| Shorelight Holdings LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input		0.425