Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 1,668	$ 27,346
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	5,361	4,345
Amortization of debt issuance costs	863	783
Non-cash operating lease expense	872	1,152
Stock-based compensation	46,526	2,210
Deferred income taxes	(227)	2,292
Changes in operating assets and liabilities
Accounts receivable	(5,670)	(12,064)
Prepaid expenses and other assets	(9,844)	(2,821)
Accounts payable	4,943	7,254
Accrued expenses and other current liabilities	(67)	15,501
Operating lease liabilities	631	(427)
Other liabilities	429	21
Net cash provided by operating activities	45,485	45,592
Cash flows from investing activities
Purchase of property and equipment	(2,715)	(674)
Capitalized software	(6,980)	(2,733)
Net cash used in investing activities	(9,695)	(3,407)
Cash flows from financing activities
Proceeds from long-term debt		28,000
Payments on long-term debt	(1,757)	(1,757)
Proceeds from exercise of stock options	2,372	692
Proceeds from early exercise of stock options		667
Employee taxes paid related to net share settlement of equity awards	(14,633)
Net cash (used in) provided by financing activities	(14,018)	27,602
Net change in cash, cash equivalents and restricted cash	21,772	69,787
Cash, cash equivalents and restricted cash
Beginning of period	971,591	26,050
End of period	993,363	95,837
Non cash investing and financing activities
Stock-based compensation included in capitalized software development costs	1,728	291
Capitalized software development costs in accrued expenses and other current liabilities	615	119
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	990,463	95,837
Restricted cash	2,900
End of period	$ 993,363	$ 95,837