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Intangible Asset - Nucynta Commercialization Agreement - Table (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 11 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 05, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019
Gross carrying amount |  | $ 521,170 |  | $ 521,170 |  |
Amortization expense |  | (16,795) | $ (10,295) |  |  |
Accumulated amortization |  | (202,061) |  | (185,266) |  |
Intangible assets, net |  | 319,109 |  | 335,904 |  |
Nucynta Products |  |  |  |  |  |
Gross carrying amount |  | 521,170 |  | 521,170 |  | $ 154,089
Amortization expense | $ (1,754) | (16,795) |  | (58,926) |  |
Accumulated amortization |  | (202,061) |  | (185,266) |  | (124,586)
Additional costs incurred |  |  |  |  | $ 367,081 |
Intangible assets, net |  | $ 319,109 |  | $ 335,904 |  | $ 29,503

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