Share based compensation arrangement by share based payment award award vesting period interval.

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Share based compensation arrangement by share based payment award equity instruments other than options granted in period total fair value.

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Share based compensation arrangement by share based payment award fair market value trading days.

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Share based compensation arrangement by share based payment award increased number of shares authorized as percentage of outstanding common stock.

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StockBasedCompensationExpense.

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Aggregate number of common shares reserved for future issuance.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Discloses use of the simplified method to calculate the expected term that stock option awards under the specified plan will exist before being exercised or terminated, the reason and justification for its use, and the periods for which the method was used if it was not used in all periods presented.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Number of shares issued under share-based payment arrangement.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of options vested.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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Stock Plans and Stock-Based Compensation - Additional Information (Details) - USD ($)			1 Months Ended	12 Months Ended
	Jan. 01, 2021	Jan. 01, 2019	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015	Nov. 30, 2020	Jan. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of shares exercised				$ 6,800,000	$ 200,000	$ 600,000
Fair value of shares vested				$ 16,800,000	$ 7,800,000	$ 3,000,000.0
Options granted				5,784,550
Common stock, shares outstanding				65,114,685	45,925,004
Share-based compensation, vested stock options				31,986	372,774	14,918
Description of expected term simplified method				The Company has opted to use the “simplified method” for estimating the expected term of options, whereby the expected term equals the arithmetic average of the vesting term and the original contractual term of the option (generally 10 years).
Expected term				10 years
Expected dividend yield				0.00%
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period							4 years
Estimated fair value, price per share							$ 0.0004
Vesting interval period							monthly
Options granted				0	0	0
Total grant date fair value of shares granted				$ 21,100,000	$ 0	$ 0
Total grant date fair value of shares vested				100,000	$ 0	$ 0
Unrecognized employee compensation costs				$ 88,900,000
Non-vested stock option recognized weighted average period				2 years 10 months 24 days
Restricted Stock Units \| Chief Executive Officer and President
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares issued							2,777,776
Price per share							$ 0.0004
Non-Employee Stock-Based Compensation
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares not vested and subject to repurchase				21,165	308,596	31,388
Stock based compensation expense				$ 700,000	$ 900,000	$ 300,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized employee compensation costs				$ 88,900,000
Non-vested stock option recognized weighted average period				2 years 10 months 24 days
Expected term				6 years 7 days	6 years 7 days
Expected dividend yield				0.00%	0.00%	0.00%
Maximum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term						9 years 11 months 12 days
Minimum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term						5 years 1 month 28 days
2015 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares not vested and subject to repurchase				165,133	455,158
Cash received from early exercise of unvested options				$ 700,000	$ 1,700,000
Award vesting period				48 months
Total shares of authorized common stock reserved for future issuance			709,558
2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued or transferred			3,570,000
Total shares of authorized common stock reserved for future issuance				1,106,209
2018 Equity Incentive Plan \| Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares not vested and subject to repurchase				738,650
2018 Equity Incentive Plan \| Restricted Stock Units \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period				4 years
Vesting interval period				annually or quarterly
2018 Equity Incentive Plan \| Restricted Stock Units \| Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting interval period				annually
2018 Equity Incentive Plan \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for issuance under evergreen provision	2,604,587
2018 Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for issuance under evergreen provision		3,570,000
Percentage of common stock outstanding		4.00%
2020 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares issued or transferred								1,000,000	3,000,000
Total shares of authorized common stock reserved for future issuance				784,975
2018 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase date of fair market value trading days			24 months
Total shares of authorized common stock reserved for future issuance			714,000	1,190,422
2018 Employee Stock Purchase Plan \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock reserved for issuance under evergreen provision	651,146
2018 Employee Stock Purchase Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of common stock as percentage of market value			85.00%
Number of shares of common stock that may be purchased by an employee on any purchase date			3,000
Number of shares that may be purchased in any calendar year			$ 25,000
Percentage of common stock shares outstanding		1.00%
Common stock, shares outstanding		1,071,000