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Intangible Asset (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Gross carrying amount | $ 521,170 | $ 521,170 |
Accumulated amortization | (202,061) | (185,266) |
Intangible assets, net | 319,109 | 335,904 |
Nucynta Products |  |  |
Gross carrying amount | 521,170 | 521,170 | $ 154,089
Accumulated amortization | (202,061) | (185,266) | (124,586)
Intangible assets, net | $ 319,109 | $ 335,904 | $ 29,503

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