Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income	$ 32,729	$ 54,683
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	13,730	8,866
Amortization of debt issuance costs	1,727	1,596
Non-cash operating lease expense	1,791	2,232
Stock-based compensation	87,202	4,331
Deferred income taxes	(364)	2,292
Loss on abandonment of operating lease assets	780	0
Changes in operating assets and liabilities, net of effects of business acquisitions
Accounts receivable	(12,873)	(10,653)
Prepaid expenses and other assets	(47,241)	(3,952)
Accounts payable	4,917	753
Accrued expenses and other current liabilities	(1,897)	23,164
Operating lease liabilities	(590)	(224)
Other liabilities	500	737
Net cash provided by operating activities	80,411	83,825
Cash flows from investing activities
Purchase of property and equipment	(3,058)	(1,779)
Acquisitions, net cash acquired	(125,728)	0
Capitalized software	(13,630)	(6,540)
Net cash used in investing activities	(142,416)	(8,319)
Cash flows from financing activities
Proceeds from long-term debt	0	28,000
Payments on long-term debt	(3,515)	(3,515)
Payment for contingent consideration	(832)	0
Payments of debt issuance costs	0	(1,306)
Proceeds from exercise of stock options	15,481	1,223
Proceeds from early exercise of stock options	0	667
Employee taxes paid related to net share settlement of equity awards	(26,017)	0
Net cash (used in) provided by financing activities	(14,883)	25,069
Net change in cash, cash equivalents and restricted cash	(76,888)	100,575
Cash, cash equivalents and restricted cash
Beginning of period	971,591	26,050
End of period	894,703	126,625
Non cash investing and financing activities
Offering costs included in account payable and accrued expenses and other current liabilities	0	736
Right-of-use assets obtained in exchange for new operating lease liabilities	471	0
Stock-based compensation included in capitalized software development costs	3,418	610
Capitalized software development costs in accounts payable and accrued expenses and other current liabilities	828	269
Purchase of property and equipment included in accounts payable and accrued expenses and other current liabilities	0	2,125
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	894,703	126,625
Restricted cash	0	0
Total cash, cash equivalents and restricted cash	$ 894,703	$ 126,625