Sale of Stock, Consideration Received on Transaction, Used To Fund Cash Election

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Sale of Stock, Number of Shares Issued in Transaction, Used To Fund Cash Election

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Share-based Compensation Arrangement by Share-based Payment Award, Increase In Number of Shares Available for Grant, Percentage Of Common Stock Shares Outstanding Prior Year

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Share-based Compensation Arrangement by Share-based Payment Award, Increase In Number of Shares Available for Grant, Period

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Canceled in Period

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Share-based Compensation Arrangement By Share-based Payment Award, Options, Cancellation Percentage

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Share-based Compensation Arrangement By Share-based Payment Award, Options, Consideration Per Share Upon Cancellation

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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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 grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Amount of cash paid to settle liability for award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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 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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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Feb. 22, 2022	Jun. 04, 2021	Jan. 19, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2022	Jun. 03, 2021	Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock for future issuance (in shares)				53,574,000	86,665,000
Grants in period, weighted average grant date fair value (in dollars per share)				$ 1.60	$ 0.42
Tax related benefit realized from the exercise of stock options and disqualifying dispositions				$ 700	$ 0	$ 0
Compensation cost not yet recognized related to unvested stock options				2,100
Stock-based compensation expense				29,884	1,525	3,534
Sale of stock, number of shares issued in transaction (in shares)		19,300,000
Options, canceled, percent (up to)								25.00%
Options, canceled in period (in dollars per share)								$ 10.00
Options, canceled in period (in shares)		300,000
Number of shares issued in transaction, used to fund cash election (in shares)		300,000
Consideration received on transaction, used to fund cash election		$ 2,600
Cost of hardware and other related revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 192	15	50
Secondary Purchase
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 13,800
Sale of stock, number of shares issued in transaction (in shares)			2,800,000
Sale of stock, price per share (in dollars per share)			$ 9.92
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized related to unvested stock options, period for recognition				1 year 8 months 12 days
Stock-based compensation expense				$ 16,170	1,560	3,667
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)				7,105,478
Compensation cost not yet recognized related to unvested stock options, period for recognition				2 years 6 months
Unrecognized stock-based compensation expense related to the unvested RSUs				$ 69,100
Vested in period (in shares)				383,211
Stock-based compensation expense				$ 14,615	0	0
Tax expense realized in connection with the vesting of RSUs				$ 200	$ 0	$ 0
Restricted stock units \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Grants in period (in shares)	7,900,000
Restricted stock units \| Liability
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants in period (in shares)				23,896
Compensation cost not yet recognized related to unvested stock options, period for recognition				2 years 6 months
Compensation cost not yet recognized				$ 100
Vested in period (in shares)				2,540
Settlement of liability-based awards for cash				$ 20
Restricted stock units \| Liability \| Cost of hardware and other related revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 40
2016 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)									22,797,955
Expiration period				10 years
Vesting period				4 years
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period				10 years
Number of shares available for grant (in shares)								22,500,611
Period for annual increase for common stock available for issuance				10 years
Percentage of aggregate common stock shares outstanding				5.00%
Grants in period (in shares)				7,100,000
2021 Plan \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock for future issuance (in shares)							7,116,519
2021 Plan \| Restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
2021 Plan \| Restricted stock units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year