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v3.20.2

Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 17, 2020 | Dec. 22, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Allowance for credit loss |  |  | $ 0 |  | $ 0 |  |
Inventory write-down |  |  |  | $ 0 |  | $ 0 |
Letters of Credit |  |  | 7,500 |  | $ 7,500 |  |
Term for letter of credit (in years) |  |  |  |  | 5 years |  |
Operating lease ROU assets |  |  | 85,810 |  | $ 85,810 |  | $ 13,693
Allowance for doubtful accounts receivable |  |  | 100 |  | 100 |  | 300
Federal income tax statutory rate |  | 21.00% |  |  |  |  |
Deferred tax liability |  |  |  |  |  |  | $ 122,000
Cash consideration received from Royalty Purchase Agreement | $ 650,000 |  |  |  | 650,000 | $ 0 |
State income tax provision |  |  | 22,100 |  | 22,100 |  |
Accounts receivable, allowance for credit loss, |  |  | 0 |  | 0 |  |
Fifth Anniversary |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Letters of Credit |  |  | $ 3,800 |  | $ 3,800 |  |
Royalty Purchase Agreement | Assigned Royalty Payments |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Cash consideration received from Royalty Purchase Agreement | $ 650,000 |  |  |  |  |  |

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