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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 | Apr. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 29, 2020
Capital structure |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 2,475,248 |  | 7,563,725 |  | 542,470 | 63,926 |  |
Price per share (in USD per share) | $ 40.40 |  | $ 30.20 |  | $ 53.37 |  |  |
Consideration received on transaction | $ 97,000 |  | $ 224,200 |  | $ 28,100 | $ 2,600 |  |
Issuance of common stock related to equity offering (in shares) |  |  |  | 4,600,000 |  |  |  |
Share price (in USD per share) |  |  |  | $ 27.04 |  |  |  |
Net proceeds from public offerings |  |  |  | $ 117,900 | $ 28,092 | $ 323,756 | $ 117,916 |
Common stock, authorized shares (in shares) |  |  |  |  | 125,000,000 | 125,000,000 |  |
Issuance of common stock related to rights exchange |  |  |  |  | $ 150,528 |  |  |
Issuance of common stock related to acquisition |  |  |  |  | $ 42,869 |  | $ 155,860 |
Common stock |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |
Common stock, authorized shares (in shares) |  |  |  |  | 125,000,000 |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 843,725 |  |  |  |  |
Issuance of common stock related to equity offering (in shares) |  |  |  | 600,000 |  |  |  |
Number of shares under option to purchase that was not exercised | 371,287 |  |  |  |  |  |  |
Option period to purchase stock | 30 days |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |
Aggregate value of remaining shares to be issued and sold |  |  |  |  | $ 93,000 |  |  |
Maximum | Common stock |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |
Consideration received on transaction |  | $ 125,000 |  |  |  |  |  |
Weighted Average |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |
Price per share (in USD per share) |  |  |  |  |  | $ 46.60 |  |
Censa |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |
Issuance of common stock related to acquisition (in shares) |  |  |  |  | 845,364 |  |  |
Issuance of common stock related to acquisition |  |  |  |  | $ 42,900 |  |  |
Rights Exchange Agreement |  |  |  |  |  |  |  |
Capital structure |  |  |  |  |  |  |  |
Shares issued under Rights Exchange Agreement |  |  |  |  | 2,821,176 |  |  | 2,821,176
Issuance of common stock related to rights exchange (in shares) |  |  |  |  | 2,821,176 |  |  |
Issuance of common stock related to rights exchange |  |  |  |  | $ 150,500 |  |  |

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