| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | 10-K | 10-K |
| Operating Activities: | | | | |
| Net loss | -10.2 | -42.5 | 5.3 | 24.2 |
| Adjustments to reconcile net loss to net cash from (used in) operating activities: | | | | |
| Depreciation and amortization | 37.0 | 27.1 | 15.1 | 9.4 |
| Stock-based compensation | 34.4 | 17.9 | 6.4 | 5.0 |
| Change in fair value of contingent consideration related to earnouts | 6.7 | 18.1 | -0.8 | |
| Deferred taxes | -12.6 | 4.4 | -4.6 | 1.4 |
| Non-cash lease costs | 2.6 | 7.9 | 6.8 | 6.3 |
| Other, net | 1.3 | -2.1 | -0.1 | |
| Changes in operating assets and liabilities: | | | | |
| Accounts receivable | -18.7 | -20.2 | 1.0 | -12.9 |
| Prepaid expenses and other assets | -0.7 | -9.6 | -4.8 | -0.7 |
| Accounts payable | -5.6 | -2.2 | 3.6 | -0.3 |
| Accrued expenses and other current liabilities | 5.8 | 16.6 | -5.3 | 5.1 |
| Operating lease liabilities | -2.4 | -7.3 | -7.1 | -6.2 |
| Other liabilities | -1.1 | -0.9 | -0.1 | -1.3 |
| Net cash provided by (used in) operating activities | 25.0 | 7.2 | 15.4 | 31.4 |
| |
| Investing Activities: | | | | |
| Capitalized software development costs | -27.6 | -20.7 | -17.4 | -14.1 |
| Purchase of property and equipment | -4.6 | -2.3 | -1.3 | -0.7 |
| Net cash used in investing activities | -100.3 | -23.0 | -55.4 | -14.8 |
| |
| Financing Activities: | | | | |
| Proceeds from line of credit | 70.0 | | 5.0 | |
| Payments on line of credit | -70.0 | | -10.0 | |
| Proceeds from exercise of stock options | 7.7 | 11.0 | 8.4 | 1.7 |
| Issuance of Class A common stock under Employee Stock Purchase Plan | 4.5 | | | |
| Tax payments related to net-share settlements on restricted stock units | -0.6 | -1.9 | -0.4 | |
| Net cash used in financing activities | -8.4 | 100.2 | 55.7 | -1.4 |
| |
| Cash and Cash Equivalents: | | | | |
| Supplemental Disclosures of Non-Cash Investing and Financing Activities: | | | | |
| Capitalized software development costs recorded in accounts payable and accrued expenses and other current liabilities | 0.9 | 0.5 | 0.1 | |
| Purchase of property and equipment recorded in accounts payable and accrued expenses and other current liabilities | 0.1 | 0.8 | | |
| Supplemental Disclosures of Cash Flow Information: | | | | |
| Income tax payments | 4.0 | 0.3 | 1.2 | 1.5 |
| Cash paid for interest | 1.9 | 2.5 | 1.4 | 1.5 |
| Supplemental Cash Flow Disclosure Related to Operating Leases: | | | | |
| Cash paid for amounts included in the measurement of lease liabilities | 3.1 | 8.2 | 7.9 | 7.2 |