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Summary of business and significant accounting policies (Tables) | 9 Months Ended
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Sep. 30, 2022
Accounting Policies [Abstract] |
Schedule of recent accounting pronouncements | Recent accounting standards
Standard |  | Description |  | Company’s date of adoption |  | Effect on the condensed consolidated financial statements or other significant matters
Standards that were adopted |  |  |  |
Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) ASU No. 2020-06 |  | This standard simplifies the accounting for certain financial instruments with characteristics of liabilities and equity. ASU 2020-06 (1) simplifies the accounting for convertible debt instruments and convertible preferred stock by removing the existing guidance in ASC 470-20, Debt: Debt with Conversion and Other Options, that requires entities to account for beneficial conversion features and cash conversion features in equity, separately from the host convertible debt or preferred stock, (2) revises the scope exception from derivative accounting in ASC 815-40 for freestanding financial instruments and embedded features that are both indexed to the issuer’s own stock and classified in stockholders’ equity, by removing certain criteria required for equity classification, and (3) revises the guidance in ASC 260, Earnings Per Share, to require entities to calculate diluted earnings per share (EPS) for convertible instruments by using the if-converted method. Companies are allowed to adopt this standard via either a modified retrospective method of transition or a fully retrospective method of transition. Under the modified retrospective method, entities should apply the guidance to transactions outstanding as of the beginning of the fiscal year in which the amendments are adopted. Transactions that were settled (or expired) during prior reporting periods are unaffected. The cumulative effect of the change should be recognized as an adjustment to the opening balance of retained earnings at the date of adoption. |  | January 1, 2022 |  | The Company adopted ASU 2020-06 using the modified retrospective transition method. As a result, prior period numbers were not restated. Upon adoption, the Company recorded a net decrease to opening additional paid-in-capital of $78.2 million, with the impact primarily related to the reclassification of Senior Convertible Notes conversion feature’s fair value from additional paid-in-capital to short-term and long-term debt. Additionally, the Company recorded a decrease to opening accumulated deficit of approximately $47.1 million, with the impact related to the reclassification of the previously amortized debt discount and deferred financing costs. After adoption, the Company saw a reduction in its reported interest expense. In addition, the Company recorded a reversal of U.S. deferred tax liabilities (net) of $7.3 million, resulting in an additional corresponding decrease to opening accumulated deficit. The Company adopted the use of the if-converted method for calculating diluted earnings per share for its Senior Convertible Notes, which 1) resulted in an increase in weighted-average diluted shares outstanding, and 2) allowed for the adding back of the after-tax impact of interest charges for the period to the numerator.
Although there are several other new accounting standards issued or proposed by the FASB, which the Company has adopted or will adopt, as applicable, the Company does not believe any of these accounting pronouncements has had or will have a material impact on its condensed consolidated financial statements.

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124437754&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124437754&loc=d3e725-108305 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22583-107794 + Details
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