Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated financial statements include Impinj, Inc. and its wholly owned subsidiaries. We have eliminated intercompany balances and transactions in consolidation. We have prepared these condensed consolidated financial statements in conformity with U.S. generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes as of and for the year ended December 31, 2022 included in Impinj, Inc.’s Annual Report on Form 10-K, which was filed with the SEC on February 13, 2023. We have reclassified certain amounts on our consolidated statement of cash flows in the prior period to conform to current period presentation. The unaudited condensed consolidated interim financial statements, in the opinion of management, reflect all adjustments, comprising normal recurring adjustments, necessary to state fairly our financial position, results of operations and our cash flows for the periods presented. Interim results are not necessarily indicative of the results for a full year or for any other future period. Business combinations and intangible assets including goodwill — We account for business combinations using the acquisition method which involves allocating the purchase price paid to assets acquired and liabilities assumed at their acquisition-date fair values. While we use our best estimates and assumptions to accurately estimate the fair value of assets acquired, liabilities assumed and contingent consideration, our estimates are inherently uncertain. On April 3, 2023, we completed the acquisition of Voyantic Oy and applied judgement in estimating the fair value of the intangible assets from the acquisition. These estimates involved using assumptions related to revenue growth rates, discount rates, underlying product or technology life cycles, and expenses necessary to support the acquired technology and estimated sales cycle for customer relationships. The acquisition-date fair value of total consideration includes cash, shares and contingent consideration. Because we are contractually obligated to pay contingent consideration upon Voyantic achieving certain specified objectives, we record a contingent consideration liability at the acquisition date. We review assumptions related to the fair value of the contingent consideration liability each reporting period and revalue the contingent consideration liability based on the revised assumptions, until the contingency is satisfied. We recognize the change in fair value of the contingent consideration liability in “General and administrative” expense on the consolidated statements of comprehensive income for the period in which the fair value changes. We calculate goodwill as the excess of the acquisition-date fair value of total consideration over the acquisition-date fair value of net assets, including the amount assigned to identifiable intangible assets. We perform an impairment assessment at least once annually, or more frequently if indicators of potential impairment exist, which includes evaluating qualitative and quantitative factors to assess the likelihood of an impairment of a reporting unit’s goodwill. We amortize identifiable intangible assets with finite lives over their useful lives on a straight-line basis. We expense acquisition-related costs, including advisory, legal, accounting, valuation, and other similar costs, in the periods in which the costs are incurred. We include the results of operations of acquired businesses in the consolidated financial statements from the acquisition date. Foreign currencies — We translate the assets and liabilities of our non-U.S. dollar functional currency subsidiary into U.S. dollars using exchange rates in effect at the end of each period. Revenue and expenses for this subsidiary are translated using rates that approximate those in effect during the period. We recognize gains and losses from these translations as a component of accumulated other comprehensive income (loss) in stockholders' equity. Our subsidiaries that use the U.S. dollar as their functional currency re-measure monetary assets and liabilities at exchange rates in effect at the end of each period, and non-monetary assets and liabilities at historical rates. We have included the gains or losses from foreign currency remeasurement in earnings.
Use of Estimates	Use of Estimates Preparing financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and related disclosures as of the date of the financial statements, as well as the reported revenue and expenses during the periods presented. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, sales incentives, percentage completion of development contracts, inventory excess and obsolescence, income taxes and fair value of stock awards. To the extent there are material differences between our estimates, judgments, or assumptions and actual results, our financial statements will be affected.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. Under ASU 2021-08, an acquirer must recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. The guidance is effective for interim and annual periods beginning after December 15, 2022, with early adoption permitted. The impact of adoption of this standard on our consolidated financial statements, including accounting policies and processes, was not material.
Recently Issued Accounting Standards Not Yet Adopted	Recently Issued Accounting Standards Not Yet Adopted Recent accounting pronouncements issued by the FASB (including its Emerging Issues Task Force), the American Institute of Certified Public Accountants, and the SEC did not have, or are not expected to have, a material impact on our present or future consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2023

The accompanying condensed consolidated financial statements include Impinj, Inc. and its wholly owned subsidiaries. We have eliminated intercompany balances and transactions in consolidation. We have prepared these condensed consolidated financial statements in conformity with U.S. generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Accordingly, these interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes as of and for the year ended December 31, 2022 included in Impinj, Inc.’s Annual Report on Form 10-K, which was filed with the SEC on February 13, 2023. We have reclassified certain amounts on our consolidated statement of cash flows in the prior period to conform to current period presentation.

The unaudited condensed consolidated interim financial statements, in the opinion of management, reflect all adjustments, comprising normal recurring adjustments, necessary to state fairly our financial position, results of operations and our cash flows for the periods presented. Interim results are not necessarily indicative of the results for a full year or for any other future period.

Business combinations and intangible assets including goodwill — We account for business combinations using the acquisition method which involves allocating the purchase price paid to assets acquired and liabilities assumed at their acquisition-date fair values. While we use our best estimates and assumptions to accurately estimate the fair value of assets acquired, liabilities assumed and contingent consideration, our estimates are inherently uncertain. On April 3, 2023, we completed the acquisition of Voyantic Oy and applied judgement in estimating the fair value of the intangible assets from the acquisition. These estimates involved using assumptions related to revenue growth rates, discount rates, underlying product or technology life cycles, and expenses necessary to support the acquired technology and estimated sales cycle for customer relationships.

The acquisition-date fair value of total consideration includes cash, shares and contingent consideration. Because we are contractually obligated to pay contingent consideration upon Voyantic achieving certain specified objectives, we record a contingent consideration liability at the acquisition date. We review assumptions related to the fair value of the contingent consideration liability each reporting period and revalue the contingent consideration liability based on the revised assumptions, until the contingency is satisfied. We recognize the change in fair value of the contingent consideration liability in “General and administrative” expense on the consolidated statements of comprehensive income for the period in which the fair value changes.

We calculate goodwill as the excess of the acquisition-date fair value of total consideration over the acquisition-date fair value of net assets, including the amount assigned to identifiable intangible assets. We perform an impairment assessment at least once annually, or more frequently if indicators of potential impairment exist, which includes evaluating qualitative and quantitative factors to assess the likelihood of an impairment of a reporting unit’s goodwill.

We amortize identifiable intangible assets with finite lives over their useful lives on a straight-line basis. We expense acquisition-related costs, including advisory, legal, accounting, valuation, and other similar costs, in the periods in which the costs are incurred. We include the results of operations of acquired businesses in the consolidated financial statements from the acquisition date.

Foreign currencies — We translate the assets and liabilities of our non-U.S. dollar functional currency subsidiary into U.S. dollars using exchange rates in effect at the end of each period. Revenue and expenses for this subsidiary are translated using rates that approximate those in effect during the period. We recognize gains and losses from these translations as a component of accumulated other comprehensive income (loss) in stockholders' equity. Our subsidiaries that use the U.S. dollar as their functional currency re-measure monetary assets and liabilities at exchange rates in effect at the end of each period, and non-monetary assets and liabilities at historical rates. We have included the gains or losses from foreign currency remeasurement in earnings.

Use of Estimates

Preparing financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and related disclosures as of the date of the financial statements, as well as the reported revenue and expenses during the periods presented. On an ongoing basis, we evaluate our estimates, including those related to revenue recognition, sales incentives, percentage completion of development contracts, inventory excess and obsolescence, income taxes and fair value of stock awards. To the extent there are material differences between our estimates, judgments, or assumptions and actual results, our financial statements will be affected.

Recently Adopted Accounting Standards

In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. Under ASU 2021-08, an acquirer must recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. The guidance is effective for interim and annual periods beginning after December 15, 2022, with early adoption permitted. The impact of adoption of this standard on our consolidated financial statements, including accounting policies and processes, was not material.

Recently Issued Accounting Standards Not Yet Adopted

Recent accounting pronouncements issued by the FASB (including its Emerging Issues Task Force), the American Institute of Certified Public Accountants, and the SEC did not have, or are not expected to have, a material impact on our present or future consolidated financial statements.