Equity-Based Compensation - Summary of Stock Options Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding	304,142	304,142
Number of Options, Granted	1,258,104
Number of Options, Outstanding	1,562,246	304,142	304,142
Number of Options, Vested and expected to vest	1,562,246
Number of Options, Exercisable	625,295
Weighted average exercise price per share, Outstanding	$ 5.58	$ 5.58
Weighted average exercise price per share, Granted	1.95
Weighted average exercise price per share, Outstanding	2.66	$ 5.58	$ 5.58
Weighted average exercise price per share, Vested and expected to vest	2.66
Weighted average exercise price per share, Exercisable	$ 3.62
Weighted average remaining contractual term (in years), Outstanding	8 years 4 months 24 days	3 years 3 months 18 days	4 years 3 months 18 days
Weighted average remaining contractual term (in years), Vested and expected to vest	8 years 4 months 24 days
Weighted average remaining contractual term (in years), Exercisable	6 years 3 months 18 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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

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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 options outstanding that can 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 options outstanding. 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 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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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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