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EQUITY INCENTIVE PLAN, Restricted Stock Unit Activity (Details) - 2013 and 2021 Plans [Member] $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) Director $ / shares shares
RSU Awards [Member] |  |  |
Restricted Stock Unit Activity [Abstract] |  |  |
Number of members of board of directors receiving grant of RSU award | Director |  |  | 2
Stock-based compensation expense | $ | $ 5,840 |  | $ 13,232
Number of Shares Underlying RSUs [Roll Forward] |  |  |
Outstanding non-vested RSUs, beginning balance (in shares) |  | 0 | 0
Granted (in shares) |  |  | 4,861,315
Repurchased (in shares) |  |  | 0
Restrictions lapsed (in shares) |  |  | 0
Outstanding non-vested RSUs, ending balance (in shares) | 4,861,315 |  | 4,861,315
Weighted Average Grant-Date Fair Value [Abstract] |  |  |
Outstanding non-vested RSUs, beginning balance (in dollars per share) | $ / shares |  | $ 0 | $ 0
Granted (in dollars per share) | $ / shares |  |  | 8.03
Repurchased (in dollars per share) | $ / shares |  |  | 0
Restrictions lapsed (in dollars per share) | $ / shares |  |  | 0
Outstanding non-vested RSUs, ending balance (in dollars per share) | $ / shares | $ 8.03 |  | $ 8.03
RSU Awards Subject to Service and Performance Conditions [Member] | Chief Executive Officer [Member] |  |  |
Number of Shares Underlying RSUs [Roll Forward] |  |  |
Granted (in shares) |  |  | 1,703,460
RSU Awards Subject to Service and Performance Conditions [Member] | General Counsel [Member] |  |  |
Number of Shares Underlying RSUs [Roll Forward] |  |  |
Granted (in shares) |  |  | 170,346
Restricted Stock Units Subject to Service and/or Performance Condition [Member] | Executive Chairman and Two Members of Board of Directors [Member] |  |  |
Number of Shares Underlying RSUs [Roll Forward] |  |  |
Granted (in shares) |  |  | 1,800,000
RSU Awards Subject to Service, Market and Performance Conditions [Member] |  |  |
Restricted Stock Unit Activity [Abstract] |  |  |
Stock-based compensation expense | $ |  | $ 7,393 | $ 13,089
RSU Awards Subject to Service, Market and Performance Conditions [Member] | Chief Executive Officer [Member] |  |  |
Number of Shares Underlying RSUs [Roll Forward] |  |  |
Granted (in shares) |  |  | 453,777

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were repurchased during the reporting period. + References No definition available. + Details
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- Definition The weighted average fair value at repurchased for nonvested equity-based awards issued 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). + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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