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Fair value measurements (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 02, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2018
Transfer from level 1 to 2 |  | $ 0 | $ 0 |
Transfer from level 2 to level 1 |  | 0 | 0 |
Transfer into level 3 |  | 0 | 0 |
Transfer out of level 3 |  | $ 0 | $ 0 |
Warrants to Purchase Series G Preferred Shares | Biosense Webster, Inc. |  |  |  |
Number of common shares converted from warrants | 607,725 |  |  |
Warrant exercise price | $ 0.16 |  |  | $ 0.01
Warrants to purchase common stock |  |  |  |
Number of common shares converted from warrants | 108,406 | 716,131 |  |
Warrant exercise price |  | $ 2.39 |  |

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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
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