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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Jan. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Liabilities: |  |  |
Contingent consideration | $ 4,193 |  | $ 0
Level 3 |  |  |
Assets [Abstract] |  |  |
Investment in debt security |  | $ 25,000 |
Recurring | Level 1 |  |  |
Assets [Abstract] |  |  |
Investment in debt security | 0 |  | 0
Total assets measured at fair value | 1,463,750 |  | 654,699
Liabilities: |  |  |
Contingent consideration | 0 |  | 0
Warranty obligations |  |  |
Warranty obligations, current | 0 |  | 0
Warranty obligations, non-current | 0 |  | 0
Total warranty obligations measured at fair value | 0 |  | 0
Total liabilities measured at fair value | 0 |  | 0
Recurring | Level 1 | Money market funds |  |  |
Assets [Abstract] |  |  |
Cash and cash equivalents | 1,463,750 |  | 654,699
Recurring | Level 2 |  |  |
Assets [Abstract] |  |  |
Investment in debt security | 0 |  | 0
Total assets measured at fair value | 0 |  | 0
Liabilities: |  |  |
Contingent consideration | 0 |  | 0
Warranty obligations |  |  |
Warranty obligations, current | 0 |  | 0
Warranty obligations, non-current | 0 |  | 0
Total warranty obligations measured at fair value | 0 |  | 0
Total liabilities measured at fair value | 0 |  | 0
Recurring | Level 2 | Money market funds |  |  |
Assets [Abstract] |  |  |
Cash and cash equivalents | 0 |  | 0
Recurring | Level 3 |  |  |
Assets [Abstract] |  |  |
Investment in debt security | 26,437 |  | 0
Total assets measured at fair value | 26,437 |  | 0
Liabilities: |  |  |
Contingent consideration | 3,540 |  | 0
Warranty obligations |  |  |
Warranty obligations, current | 10,163 |  | 8,267
Warranty obligations, non-current | 23,156 |  | 20,469
Total warranty obligations measured at fair value | 33,319 |  | 28,736
Total liabilities measured at fair value | 36,859 |  | 28,736
Recurring | Level 3 | Money market funds |  |  |
Assets [Abstract] |  |  |
Cash and cash equivalents | $ 0 |  | $ 0

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