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Class of Warrant or Right, Preferred Stock Available to be Called, Percentage Earned

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Class of Warrant or Right, Preferred Stock Available to be Called, Percentage Forfeited

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Share-Based Payment Arrangement, Evergreen Provision, Percentage of Outstanding Shares

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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

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Face (par) amount of debt instrument at time of issuance.

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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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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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The cash outflow to reacquire common stock during the period.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Percentage of subsidiary's or equity investee's stock owned by parent company before stock transaction.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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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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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Price of a single share of a number of saleable stocks of a company.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Number of share options (or share units) exercised during the current period.

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Stockholders’ Equity and Stock-based Compensation - Narrative (Details) - USD ($)									1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2021	Aug. 13, 2021	Aug. 12, 2021	Jun. 30, 2021	May 22, 2021	Mar. 01, 2021	Jan. 25, 2021	Mar. 09, 2020	Feb. 28, 2021	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jul. 15, 2021	Feb. 22, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock authorized (in shares)		270,000,000
Common stock, number of shares authorized (in shares)											250,000,000		250,000,000				142,804,498
Common stock, par value (in dollars per share)											$ 0.00001		$ 0.00001				$ 0.00001
Common stock issued (in shares)											80,580,232		80,580,232				62,510,690
Common stock outstanding (in shares)		79,772,262									80,580,232		80,580,232				62,510,690
Preferred stock outstanding (in shares)		0									0		0
Number of shares exercised following the merger (in shares)		(807,970)											(1,297,711)
Payments for repurchase of common and preferred stock													$ 40,000,000	$ 0
Proceeds from short-term borrowings													25,000,000	2,458,000
Estimated fair value of warrants											$ 33,254,000		33,254,000		$ 30,500,000		$ 3,206,000
Increase (decrease) in fair value of warrants											$ 2,712,000	$ 1,324,000	$ (9,826,000)	1,317,000
Conversion of warrants to common stock, price per share (in dollars per share)											$ 11.50		$ 11.50
Options exercisable, aggregate intrinsic value											$ 27,526,000	$ 21,400,000	$ 27,526,000	$ 21,400,000
Shares excluded from calculation of diluted earnings per share (in shares)											24,510,729	21,903,861	19,897,500	21,903,861
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares excluded from calculation of diluted earnings per share (in shares)											20,206,069	499,534	19,897,500	499,534
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, number of shares reserved for future issuance (in shares)			5,982,922
Vesting period			4 years
Evergreen provision, percentage of outstanding shares			3.00%
2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, number of shares reserved for future issuance (in shares)			1,595,445
Evergreen provision, percentage of outstanding shares			0.50%
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost for unvested options											$ 900,000		$ 900,000
Unrecognized compensation cost, period of recognition													1 year 11 months 26 days
Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)														5 years 10 days
Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)														6 years 2 months 23 days
Options \| August 31, 2021 Stock Option Modifications
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of accelerated vested shares (in shares)	273,571
Exercise price (in dollars per share)	$ 0.28
Expected term (in years)	6 years 3 months
Risk-free interest rate	0.86%
Expected volatility	97.00%
Remeasured fair value (in dollars per share)	$ 10.91
Incremental compensation cost for accelerated vesting	$ 2,900,000
Options \| May 22, 2021 Stock Option Modifications
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of accelerated vested shares (in shares)					205,618
Exercise price (in dollars per share)					$ 0.28
Expected term (in years)					1 year
Risk-free interest rate					0.04%
Expected volatility					65.00%
Remeasured fair value (in dollars per share)					$ 10.78
Incremental compensation cost for accelerated vesting					$ 2,200,000
Options \| January 25, 2021 Stock Option Modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of accelerated vested shares (in shares)							261,070
Expected term (in years)							1 year
Risk-free interest rate							0.10%
Expected volatility							78.00%
Remeasured fair value (in dollars per share)							$ 20.91
Incremental compensation cost for accelerated vesting							$ 5,400,000
Options \| January 25, 2021 Stock Option Modification \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share)							$ 0.04
Options \| January 25, 2021 Stock Option Modification \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in dollars per share)							$ 0.28
Term Loan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial borrowing capacity									$ 40,000,000							$ 40,000,000
Proceeds from short-term borrowings						$ 25,000,000			$ 25,000,000
Estimated fair value of warrants																$ 15,600,000
Equipment Loan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Initial borrowing capacity										$ 4,500,000
Proceeds from long-term borrowings								$ 1,500,000
Stock Purchase Warrants \| Term Loan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of preferred stock available to be called									1.00%							1.00%
Preferred stock available to be called, percentage earned									80.00%		80.00%		80.00%
Preferred stock available to be called, percentage forfeited				20.00%							20.00%		20.00%
Estimated fair value of warrants																$ 15,600,000
Increase (decrease) in fair value of warrants											$ 300,000		$ (10,700,000)
Stock Purchase Warrants \| Equipment Loan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated fair value of warrants								$ 30,000.00
Increase (decrease) in fair value of warrants											$ 400,000		$ (1,100,000)
Number of shares available for purchase (in shares)										774,527
Public Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants outstanding (in shares)											8,625,000		8,625,000
Private Placement Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase (decrease) in fair value of warrants											$ 2,000,000		$ 2,000,000
Number of warrants outstanding (in shares)											11,272,500		11,272,500
Other Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants outstanding (in shares)											308,569		308,569
Conversion of warrants to common stock, price per share (in dollars per share)											$ 0.20		$ 0.20
Co-Founder Divestment and Share Repurchase Agreements
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of equity interests sold				100.00%
Payments for repurchase of common and preferred stock				$ 40,000,000
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, number of shares authorized (in shares)		250,000,000
Common stock, par value (in dollars per share)		$ 0.00001									$ 0.00001		$ 0.00001
Common stock issued (in shares)											80,580,232		80,580,232
Common stock outstanding (in shares)											80,580,232		80,580,232
Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, number of shares authorized (in shares)		20,000,000
Preferred stock, par value (in dollars per share)		$ 0.00001