SHARE-BASED AWARDS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands |
6 Months Ended |
12 Months Ended |
|
|
Dec. 31, 2020 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 18, 2020 |
Feb. 06, 2020 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options exercised, aggregate intrinsic value |
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$ 46,200
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$ 9,700
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$ 39,200
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| Options granted |
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$ 0.00
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$ 1.50
|
$ 1.50
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| Stock-based compensation expense |
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$ 38,005
|
$ 13,196
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$ 14,974
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| 2014 Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares authorized |
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106,320,623
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| 2020 Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common stock reserved for issuance |
43,508,048
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43,508,048
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| Total number of shares of common stock outstanding on December 31 of the immediately preceding calendar year |
5.00%
|
5.00%
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| Stock option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration period |
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10 years
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| Vesting period |
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4 years
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| Incentive stock options |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration period |
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5 years
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| Employee Stock Purchase Plan | Employee Stock Purchase Plan |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Number of shares authorized |
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54,385,060
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| Common stock reserved for issuance |
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5,438,506
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| Total number of shares of common stock outstanding on December 31 of the immediately preceding calendar year |
1.00%
|
1.00%
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| RSU |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Expiration period |
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7 years
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| Vesting period |
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4 years
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| Unamortized stock-based compensation costs |
$ 503,000
|
$ 503,000
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| RSU | Time-based vesting condition | Public Offering And Over-Allotment Option |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unamortized stock-based compensation costs |
80,200
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$ 80,200
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| Options that have fully satisfied the time-based vesting condition (in shares) |
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9,201,201
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| Vesting of restricted shares |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vested options, aggregate intrinsic value |
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$ 8,900
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$ 1,500
|
$ 100
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| Options that have fully satisfied the time-based vesting condition (in shares) |
|
1,339,000
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| Vesting of restricted shares | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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3 years
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| Vesting of restricted shares | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period |
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4 years
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| Market Condition Award | Executive Officer |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Grant date fair value for awards |
$ 357,400
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$ 357,400
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| Stock-based compensation expense |
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$ 19,900
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| Market Condition Award | Executive Officer | Minimum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Requisite service period |
6 months
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| Market Condition Award | Executive Officer | Maximum |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Requisite service period |
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3 years 6 months
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| Unvested stock options and Restricted Shares |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Unamortized stock-based compensation costs |
$ 13,500
|
$ 13,500
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| Unamortized stock-based compensation period (in years) |
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1 year 9 months 18 days
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