Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions We have engaged in certain transactions with other companies related to us by common ownership. We have entered into various operating leases to lease facilities from these affiliated companies. Rent expense associated with our related party leases was $0.7 million and $0.7 million for the three months ended March 31, 2020 and 2019, respectively. As of March 31, 2020, $5.7 million of our operating lease right-of-use assets and $6.4 million of our lease liabilities were associated with related party leases. Tax Receivable Agreement Mosing Holdings, LLC ("Mosing Holdings") and its permitted transferees converted all of their Preferred Stock into shares of our common stock on a one-for-one basis on August 26, 2016, subject to customary conversion rate adjustments for stock splits, stock dividends and reclassifications and other similar transactions, by delivery of all of their interests in FICV to us (the “Conversion”). As a result of an election under Section 754 of the Internal Revenue Code, made by FICV, the Conversion resulted in an adjustment to the tax basis of the tangible and intangible assets of FICV with respect to the portion of FICV transferred to FINV by Mosing Holdings and its permitted transferees. These adjustments are allocated to FINV. The adjustments to the tax basis of the tangible and intangible assets of FICV described above would not have been available absent this Conversion. The basis adjustments may reduce the amount of tax that FINV would otherwise be required to pay in the future. These basis adjustments may also decrease gains (or increase losses) on future dispositions of certain capital assets to the extent tax basis is allocated to those capital assets. The tax receivable agreement ("TRA") that we entered into with FICV and Mosing Holdings in connection with our IPO generally provides for the payment by FINV of 85% of the amount of the net cash savings, if any, in U.S. federal, state and local income tax and franchise tax that we actually realize (or are deemed to realize in certain circumstances) in periods after our IPO as a result of (i) tax basis increases resulting from the Conversion and (ii) imputed interest deemed to be paid by us as a result of, and additional tax basis arising from, payments under the TRA. We will retain the benefit of the remaining 15% of these cash savings, if any. Payments we make under the TRA will be increased by any interest accrued from the due date (without extensions) of the corresponding tax return to the date of payment specified by the TRA. The payments under the TRA will not be conditioned upon a holder of rights under the TRA having a continued ownership interest in FINV. The estimation of the amount and timing of payments under the TRA is by its nature imprecise. For purposes of the TRA, cash savings in tax generally are calculated by comparing our actual tax liability to the amount we would have been required to pay had we not been able to utilize any of the tax benefits subject to the TRA. The amounts payable, as well as the timing of any payments, under the TRA are dependent upon significant future events and assumptions, including the amount and timing of the taxable income we generate in the future. As of March 31, 2020, FINV has had a cumulative loss over the prior 36-month period. Based on this history of losses, as well as uncertainty regarding the timing and amount of future taxable income, we are no longer able to conclude that there will be future cash savings that will lead to additional payouts under the TRA. Additional TRA liability may be recognized in the future based on changes in expectations regarding the timing and likelihood of future cash savings. The payment obligations under the TRA are our obligations and are not obligations of FICV. The term of the TRA commenced upon the completion of the IPO and will continue until all tax benefits that are subject to the TRA have been utilized or expired, unless FINV elects to exercise its right to terminate the TRA (or the TRA is terminated due to other circumstances, including our breach of a material obligation thereunder or certain mergers or other changes of control), and we make the termination payment specified in the TRA. If FINV elects to terminate the TRA early, which it may do in its sole discretion, (or if it terminates as a result of our breach) it would be required to make a substantial, immediate lump-sum payment equal to the present value of the hypothetical future payments that could be required to be paid under the TRA (based upon certain assumptions and deemed events set forth in the TRA, including the assumption that it has sufficient taxable income to fully utilize such benefits), determined by applying a discount rate equal to the long-term Treasury rate in effect on the applicable date plus 300 basis points. Any early termination payment may be made significantly in advance of the actual realization, if any, of such future benefits. In addition, payments due under the TRA will be similarly accelerated following certain mergers or other changes of control. In these situations, FINV’s obligations under the TRA could have a substantial negative impact on our liquidity and could have the effect of delaying, deferring or preventing certain mergers, asset sales, other forms of business combinations or other changes of control. For example, if the TRA were terminated on March 31, 2020, the estimated termination payment would be approximately $57.0 million (calculated using a discount rate of 4.15%). The foregoing number is merely an estimate and the actual payment could differ materially. Because FINV is a holding company with no operations of its own, its ability to make payments under the TRA is dependent on the ability of FINV's operating subsidiaries to make distributions to it in an amount sufficient to cover FINV’s obligations under such agreement. The ability of certain of FINV’s operating subsidiaries to make such distributions will be subject to, among other things, the applicable provisions of Dutch law that may limit the amount of funds available for distribution and restrictions in our debt instruments. To the extent that FINV is unable to make payments under the TRA for any reason (except in the case of an acceleration of payments thereunder occurring in connection with an early termination of the TRA or certain mergers or change of control) such payments will be deferred and will accrue interest until paid, and FINV will be prohibited from paying dividends on its common stock.