Summary of Significant Accounting Policies	6 Months Ended
Summary of Significant Accounting Policies	Jun. 30, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies 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, as a reduction of additional paid-in capital generated as a result of such offering. On January 14, 2021, the Company completed a Follow-on Offering of common stock, as defined and discussed in detail in Note 10, 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. Recently adopted accounting pronouncements Leases In February 2016, the FASB issued Leases (Topic 842) ("ASU 2016-02"), as subsequently amended, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors), and replaces the existing guidance in ASC 840, Leases. The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine the recognition pattern of lease expense over the term of the lease. In addition, a lessee is required to record (i) a right-of-use asset and a lease liability the balance sheet for all leases with accounting lease terms of more than 12 months regardless of whether it is an operating or financing lease, and (ii) lease expense for operating leases and amortization and interest expense for financing leases, in statement of operations. Leases with a term of 12 months or less may be accounted for similar to existing guidance for operating leases under ASC 840. In July 2018, the FASB issued ASU 2018-11, Leases ("Topic 842"), which added an optional transition method that allows companies to adopt the standard as of the beginning of the year of adoption as opposed to the earliest comparative period presented. The Company adopted the new standard effective January 1, 2021, using the modified retrospective transition approach which uses the effective date as the date of initial application with no adjustment to prior periods presented. There was no adjustment to the opening balance of retained earnings. At adoption date, the new standard resulted in the recognition of an operating lease Right-of-Use ("ROU") asset of $16.9 million included under Other Assets, and a corresponding operating lease liabilities of $17.2 million included in Other Liabilities on the consolidated balance sheets. The difference of $0.3 million between the operating lease ROU assets and operating lease liabilities represents reclassification of deferred rent liability (the difference between the straight-line rent expenses and paid rent amounts under the leases) to operating lease ROU assets from other liabilities at the adoption date. The adoption of the standard did not have a material impact on the Company’s consolidated statements of operations and comprehensive loss, or consolidated statements of cash flows. The adoption impact relates to the Company’s existing operating leases for office spaces in the US, Netherlands and Israel. The Company has elected to apply the package of practical expedients requiring no reassessment of whether any expired or existing contracts are or contain leases, the lease classification of any expired or existing leases, or the capitalization of initial direct costs for any existing leases. Additionally, the Company elected the practical expedients that permit the exclusions of leases considered to be short-term. Current Expected Credit Losses In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses ("Topic 326"): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). ASU 2016-13 introduced a current expected credit loss ("CECL") model for measuring expected credit losses for certain types of financial instruments held at the reporting date requiring significant judgment in application based on historical experience, current conditions and reasonable supportable forecasts, but is not prescriptive about certain aspects of estimating expected losses. The guidance replaced the current incurred loss model for measuring expected credit losses and provided for additional disclosure requirements. Subsequently, the FASB issued additional ASUs on Topic 326 that did not change the core principle of the guidance in ASU 2016-13, but provided clarification and implementation guidance on certain aspects of ASU 2016-13, and have the same effective date and transition requirements as ASU 2016-13. The Company adopted the guidance using a modified retrospective approach as of January 1, 2021 which resulted in no cumulative-effect adjustment to retained earnings. The updated guidance in ASU 2016-13 also amended the previous other-than-temporary impairment (“OTTI”) model for available-for-sale fixed income securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. In addition, the length of time a security has been in an unrealized loss position will no longer impact the determination of whether a credit loss exists. The Company adopted the guidance related to available-for-sale fixed income securities on January 1, 2021 using a prospective transition approach for available-for-sale fixed income securities that were purchased with credit deterioration or had recognized an OTTI write-down prior to the effective date. The effect of the prospective transition approach was to maintain the same amortized cost basis before and after the effective date.