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Summary of significant accounting policies - Inventory (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Accounting Policies [Abstract] |  |  |
Raw materials | $ 1,501 |  | $ 1,418
Work in progress | 8,070 |  | 7,721
Finished goods | 5,710 |  | 6,717
Total inventory | 15,281 |  | $ 15,856
Inventory write-down | $ 600 | $ 1,400 |

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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