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STOCK-BASED COMPENSATION - Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
STOCK-BASED COMPENSATION |  |  |  |
Options available for grant, beginning of period | 11,048 | 4,299,140 | 4,299,140 |
Increase to options available under the plan |  |  |  | 5,242,189
Options granted | (18,335) | 0 | (10,932,615) |
Options exercised | (6,465,857) |  | (996,991) |
Options forfeited | 18,335 |  | 870,317 |
Options expired |  |  | 532,017 |
Options available for grant, end of period | 11,048 |  | 11,048 | 4,299,140
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance | 51,379,939 | 42,846,649 | 42,846,649 |
Options granted | 18,335 | 0 | 10,932,615 |
Options exercised | (6,465,857) |  | (996,991) |
Options forfeited | (18,335) |  | (870,317) |
Options expired |  |  | (532,017) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 44,914,082 |  | 51,379,939 | 42,846,649
Weighted average exercise price, options outstanding, beginning of period (per share) | $ 0.58 |  | $ 0.56 | $ 0.34
Weighted average exercise price, options granted (per share) | 3.47 |  | 1.23 |
Weighted average exercise price, options exercised (per share) | 0.43 |  | 0.38 |
Weighted average exercise price, options forfeited (per share) | 0.51 |  | 0.49 |
Weighted average exercise price, options expired (per share) |  |  | 0.35 |
Weighted average exercise price, options outstanding, end of period (per share) | $ 0.58 |  | $ 0.56 | $ 0.34
Weighted average remaining contractual life, options outstanding | 7 years 18 days |  | 7 years 2 months 15 days | 6 years 9 months 25 days
Aggregate intrinsic value, options outstanding | $ 202,792 |  | $ 46,516 | $ 5,821
Weighted average grant date fair value of stock options granted (per share) | $ 2.24 |  | $ 0.82 | $ 0.34
Intrinsic value of options exercised | $ 30,200 | $ 100 | $ 1,100 | $ 100

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- Definition Number of additional shares authorized for issuance under share-based payment arrangement. + References No definition available. + Details
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- Definition 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. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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