Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]
Basis of presentation	The accompanying interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly-owned subsidiaries. All material intercompany transactions and balances have been eliminated upon consolidation. All foreign currency amounts in the condensed consolidated statement of operations and comprehensive loss have been translated using an average rate for the reporting period. All foreign currency balances in the balance sheet have been translated using the spot rate at the end of the reporting period. All figures expressed, except share amounts, are in U.S. dollars in millions.
Use of estimates	The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. On an ongoing basis, the Company’s management evaluates estimates, including those related to contingent assets and liabilities as of the date of the financial statements as well as the reported amounts of revenue and expense during the reporting period. Such estimates are based on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. These estimates, judgments and assumptions can affect the reported amounts of assets and liabilities at the dates of the condensed consolidated financial statements, and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates. Significant estimates reflected in the Company’s condensed consolidated financial statements include, but are not limited to, reserves for loss and loss adjustment expense, reinsurance recoverables on unpaid losses, valuation allowance on deferred tax assets and valuation on stock-based compensation prior to the Company's IPO.
Cash, cash equivalents and restricted cash	Cash and cash equivalents consist primarily of bank deposits and money market accounts with maturities of three months or less at the date of acquisition and are stated at cost, which approximates fair value. The Company’s restricted cash relates to security deposits for office leases in Israel. The carrying value of restricted cash approximates fair value.
Deferred offering costs	The Company capitalizes certain legal, accounting and other third-party fees that are directly associated with in-process equity financings as deferred offering costs until such financings are consummated. After consummation of the equity financing, these costs are recorded as a reduction to the carrying value of stockholders' equity (deficit) as a reduction of additional paid-in capital generated as a result of such offering. In connection with the Initial Public Offering, the Company incurred total offering costs of $32.4 million, of which $28.9 million was recorded as a reduction to gross proceeds, and $3.5 million was recognized as a component of general and administrative expense in 2019. On January 14, 2021, the Company completed a Follow-on Offering of common stock, as defined and discussed in detail in Note 9, which generated net proceeds of $525.7 million, after deducting underwriting discounts and offering costs. On February 1, 2021, the underwriters exercised their option to purchase additional shares, and generated additional net proceeds to us of $114.6 million. Deferred offering costs from the Follow-on Offering amounted to $0.4 million.
Recent accounting pronouncements	The Company currently qualifies as an “emerging growth company” under the Jumpstart Our Business Startups Act of 2012, or the JOBS Act. Accordingly, the Company is provided the option to adopt new or revised accounting guidance either (i) within the same periods as those otherwise applicable to non-emerging growth companies or (ii) within the same time periods as private companies. The Company has elected to adopt new or revised accounting guidance within the same time period as private companies, unless, as indicated below, management determines it is preferable to take advantage of early adoption provisions offered within the applicable guidance. ASU 2019-12, Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes, simplifies the various aspects related to accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and clarifies and amends the existing guidance to improve consistent application. The adoption of ASU 2019-12 beginning January 1, 2021 did not have a material impact on our condensed consolidated financial statement and related disclosures. In February 2016, the FASB issued Leases (Topic 842) (“ASU 2016-02”), whereby a lessee will be required to recognize for all leases at the commencement date a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. A modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements must be applied. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. ASU 2016-02 is effective for the Company’s annual periods beginning after December 15, 2020, and interim periods within fiscal years beginning after December 15, 2021. The adoption of the new standard is expected to result in the recognition of additional lease liabilities and right-of-use assets as of January 1, 2022. The Company is evaluating the potential impact of this pronouncement. In June 2016, the FASB issued Financial Instruments — Credit Losses, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 will change the way entities recognize impairment of financial assets by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, including, among others, held-to-maturity debt securities, premium receivables, and reinsurance recoverable. The valuation allowance is a measurement of expected losses that is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This methodology is referred to as the current expected credit loss model. ASU 2016-13 requires a valuation allowance to be calculated on these financial assets, as well as available for sale securities, and that they be presented on the financial statements net of the valuation allowance. ASU 2016-13 is effective for the Company’s annual periods beginning after December 15, 2022, including interim periods within those fiscal years. The Company is currently evaluating the impact of ASU 2016-13 on its financial condition and results of operations, with a primary focus on its reinsurance recoverable.
Reclassification	Certain accounts in the prior period financial statements were reclassified to conform with the current period presentation.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2021

The accompanying interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and its wholly-owned subsidiaries. All material intercompany transactions and balances have been eliminated upon consolidation. All foreign currency amounts in the condensed consolidated statement of operations and comprehensive loss have been translated using an average rate for the reporting period. All foreign currency balances in the balance sheet have been translated using the spot rate at the end of the reporting period. All figures expressed, except share amounts, are in U.S. dollars in millions.

Use of estimates

The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. On an ongoing basis, the Company’s management evaluates estimates, including those related to contingent assets and liabilities as of the date of the financial statements as well as the reported amounts of revenue and expense during the reporting period. Such estimates are based on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. These estimates, judgments and assumptions can affect the reported amounts of assets and liabilities at the dates of the condensed consolidated financial statements, and the reported amounts of expenses during the reporting period. Actual results could differ from those estimates. Significant estimates reflected in the Company’s condensed consolidated financial statements include, but are not limited to, reserves for loss and loss adjustment expense, reinsurance recoverables on unpaid losses, valuation allowance on deferred tax assets and valuation on stock-based compensation prior to the Company's IPO.

Cash, cash equivalents and restricted cash

Cash and cash equivalents consist primarily of bank deposits and money market accounts with maturities of three months or less at the date of acquisition and are stated at cost, which approximates fair value. The Company’s restricted cash relates to security deposits for office leases in Israel. The carrying value of restricted cash approximates fair value.

Deferred offering costs

The Company capitalizes certain legal, accounting and other third-party fees that are directly associated with in-process equity financings as deferred offering costs until such financings are consummated. After consummation of the equity financing, these costs are recorded as a reduction to the carrying value of stockholders' equity (deficit) as a reduction of additional paid-in capital generated as a result of such offering. In connection with the Initial Public Offering, the Company incurred total offering costs of $32.4 million, of which $28.9 million was recorded as a reduction to gross proceeds, and $3.5 million was recognized as a component of general and administrative expense in 2019. On January 14, 2021, the Company completed a Follow-on Offering of common stock, as defined and discussed in detail in Note 9, which generated net proceeds of $525.7 million, after deducting underwriting discounts and offering costs. On February 1, 2021, the underwriters exercised their option to purchase additional shares, and generated additional net proceeds to us of $114.6 million. Deferred offering costs from the Follow-on Offering amounted to $0.4 million.

Recent accounting pronouncements

The Company currently qualifies as an “emerging growth company” under the Jumpstart Our Business Startups Act of 2012, or the JOBS Act. Accordingly, the Company is provided the option to adopt new or revised accounting guidance either (i) within the same periods as those otherwise applicable to non-emerging growth companies or (ii) within the same time periods as private companies.

The Company has elected to adopt new or revised accounting guidance within the same time period as private companies, unless, as indicated below, management determines it is preferable to take advantage of early adoption provisions offered within the applicable guidance.

ASU 2019-12, Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes, simplifies the various aspects related to accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and clarifies and amends the existing guidance to improve consistent application. The adoption of ASU 2019-12 beginning January 1, 2021 did not have a material impact on our condensed consolidated financial statement and related disclosures.

In February 2016, the FASB issued Leases (Topic 842) (“ASU 2016-02”), whereby a lessee will be required to recognize for all leases at the commencement date a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term. Under the new guidance, lessor accounting is largely unchanged. A modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements must be applied. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. ASU 2016-02 is effective for the Company’s annual periods beginning after December 15, 2020, and interim periods within fiscal years beginning after December 15, 2021. The adoption of the new standard is expected to result in the recognition of additional lease liabilities and right-of-use assets as of January 1, 2022. The Company is evaluating the potential impact of this pronouncement.

In June 2016, the FASB issued Financial Instruments — Credit Losses, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 will change the way entities recognize impairment of financial assets by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of many financial assets, including, among others, held-to-maturity debt securities, premium receivables, and reinsurance recoverable. The valuation allowance is a measurement of expected losses that is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This methodology is referred to as the current expected credit loss model. ASU 2016-13 requires a valuation allowance to be calculated on these financial assets, as well as available for sale securities, and that they be presented on the financial statements net of the valuation allowance. ASU 2016-13 is effective for the Company’s annual periods beginning after December 15, 2022, including interim periods within those fiscal years. The Company is currently evaluating the impact of ASU 2016-13 on its financial condition and results of operations, with a primary focus on its reinsurance recoverable.

Reclassification

Certain accounts in the prior period financial statements were reclassified to conform with the current period presentation.