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Share-based Compensation - Schedule of share based compensation stock option activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Number of options - Beginning balance	8,329	6,991	6,991
Number of options - Granted	888	2,072
Number of options - Exercised	(1,987)
Number of options - Forfeited	(247)	(626)
Number of options - Ending balance	6,983	8,437	8,329	6,991
Number of options - Vested and exercisable	3,156	0
Weighted average exercise price per share - Beginning balance	$ 2.43	$ 2.13	$ 2.13
Weighted average exercise price per share - Granted	4.00	3.50
Weighted average exercise price per share - Exercised	1.93
Weighted average exercise price per share - Forfeited	2.89	2.52
Weighted average exercise price per share - Ending balance	2.76	2.44	$ 2.43	$ 2.13
Weighted average exercise price per share - Vested and exercisable	$ 2.12	$ 0
Weighted average remaining contractual life	2 years 11 months 23 days	3 years 3 months 18 days	3 years 21 days	3 years 4 months 24 days
Weighted average remaining contractual life - Vested and exercisable	1 year 8 months 12 days
Aggregate intrinsic value	$ 161,159	$ 40,906	$ 97,000	$ 29,468
Vested and exercisable, Aggregate intrinsic value	$ 74,874

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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