Long-term Debt	9 Months Ended
Long-term Debt	Sep. 30, 2021
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt In November 2018, we entered into an amended first lien credit and guaranty agreement, or the 2018 Credit Facility, which consisted of a first lien term loan facility, or 2018 Term Loan, with a principal amount of $535.0 million and a 2018 Revolving Facility of $40.0 million, or the 2018 Revolving Facility. In July 2021, upon the completion of our IPO, we repaid the then outstanding principal of $521.6 million of our 2018 Term Loan in full. We incurred a loss on debt extinguishment of $7.7 million related to unamortized debt issuance costs. On July 2, 2021, we entered into an amended and restated credit and guaranty agreement, or 2021 Revolving Facility, providing for revolving borrowings of up to $150.0 million with an availability period of five years. Under the 2021 Revolving Facility, we can use up to $20.0 million in letters of credit as well as borrowings on same-day notice, referred to as swingline loans, in an amount of up to $10.0 million. Additional debt issuance costs of $0.8 million were allocated to the 2021 Revolving Facility. The interest rate applicable to the 2021 Revolving Facility is, at our option, at a rate equal to the greatest of (i) the administrative agent’s prime rate (ii) the federal funds effective rate plus 1/2 of 1.0% or (iii) one month LIBOR (subject to a 1.00% floor), plus 1.00% or LIBOR (subject to a 0.00% floor) plus 2.00%. The interest rate margins under the 2021 Revolving Facility are subject to one reduction of 0.25% and a further reduction of 0.25% upon achieving total net first lien leverage ratios of 3.50 to 1.00 and 2.50 to 1.00, respectively. We are required to pay a commitment fee in respect of unutilized commitments under the 2021 Revolving Facility. The commitment fee is, initially, 0.35% per annum. The commitment fee is subject to one reduction of 0.10% if the total net first lien leverage ratio does not exceed 3.50 to 1.00. We are also required to pay customary letter of credit fees and agency fees. We have the option to voluntarily repay outstanding loans under the 2021 Revolving Facility at any time without premium or penalty, other than customary “breakage” costs with respect to LIBOR loans. There is no scheduled amortization under the 2021 Revolving Facility. Any principal amount outstanding is due and payable in full at maturity, five years from the closing date of the 2021 Revolving Facility. Obligations under the 2021 Revolving Facility are guaranteed by our existing and future direct and indirect material wholly-owned domestic subsidiaries, subject to certain exceptions. In March 2020, in response to the World Health Organization’s declaration of COVID-19, we drew down the full $40.0 million available from our 2018 Revolving Facility. The 2018 Revolving Facility was paid in full in May 2020. We determined that the fair value of our long-term debt approximated its carrying value as of December 31, 2020. We estimated the fair value of our long-term debt using Level 2 inputs based on recent observable trades of our 2018 Term Loan. The effective interest rate of the 2018 Term Loan was 5.1% for December 31, 2020. At September 30, 2021, we had no amounts outstanding under our 2021 Revolving Facility or any outstanding letters of credit and at December 31, 2020, we had no amounts outstanding under our 2018 Revolving Facility or any outstanding letters of credit. We were in compliance with all financial covenants as of September 30, 2021 and December 31, 2020 under the respective credit facilities.