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Capital structure - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Aug. 31, 2019 | Jan. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021
Common stock |  |  |  |  |  |  |
Net consideration received on transaction | $ 97,000 |  | $ 224,200 |  | $ 28,100 |  |
Number of shares issued in transaction (in shares) | 2,475,248 |  | 7,563,725 | 0 | 542,470 |  |
Price per share (in USD per share) | $ 40.40 |  | $ 30.20 |  | $ 53.37 |  |
Issuance of common stock related to rights exchange |  |  |  |  | $ 150,528 |  |
Issuance of common stock related to acquisition |  |  |  |  | $ 42,869 |  |
Common stock, authorized shares (in shares) |  |  |  | 250,000,000 | 125,000,000 |  | 250,000,000
Common stock |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Common stock, authorized shares (in shares) |  |  |  | 250,000,000 |  |  |
Over-Allotment Option |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Option period to purchase stock | 30 days |  |  |  |  |  |
Number of shares under option to purchase that was not exercised | 371,287 |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 843,725 |  |  |  |
Censa [Member] |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Issuance of common stock related to acquisition (in shares) |  |  |  |  | 845,364 |  |
Issuance of common stock related to acquisition |  |  |  |  | $ 42,900 |  |
Rights Exchange Agreement |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Issuance of common stock related to rights exchange (in shares) |  |  |  |  | 2,821,176 |  |
Issuance of common stock related to rights exchange |  |  |  |  | $ 150,500 |  |
Sales Agreement | Common stock |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Net consideration received on transaction |  |  |  |  |  | $ 2,600 |
Number of shares issued in transaction (in shares) |  |  |  |  |  | 63,926 |
Maximum |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Aggregate value of remaining shares to be issued and sold |  |  |  | $ 93,000 |  |  |
Maximum | Sales Agreement | Common stock |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Net consideration received on transaction |  | $ 125,000 |  |  |  |  |
Weighted Average [Member] | Sales Agreement | Common stock |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Price per share (in USD per share) |  |  |  |  |  | $ 46.60 |

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