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Intangible assets and goodwill - (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Future amortization expense | ​
​ | ​ | ​ | ​
​ |  | As of December 31, 2020
2021 | ​ | $ | 42,341
2022 | ​ |  | 42,341
2023 | ​ |  | 42,341
2024 | ​ |  | 7,064
2025 and thereafter | ​ |  | 4,741
Total | ​ | $ | 138,828

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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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