Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Consolidated net income	$ 78,954,000	$ 110,373,000	$ 77,553,000
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	45,334,000	40,476,000	10,191,000
Currency loss (gain) on foreign denominated transactions	155,000	(70,000)	23,000
Deferred taxes	(22,114,000)	6,163,000	22,235,000
Provision for doubtful accounts	1,769,000	999,000	1,930,000
Stock-based compensation expense	54,777,000	53,525,000	45,090,000
Amortization of deferred financing costs	136,000	0	0
Amortization of deferred contract costs	11,067,000	12,653,000	11,605,000
Impairment of long-lived assets	165,000	3,128,000	1,151,000
Changes in operating assets and liabilities:
Accounts receivable	152,954,000	(174,771,000)	3,889,000
Inventory	14,374,000	(17,318,000)
Prepaid expenses, prepaid income taxes, and other assets	(6,573,000)	(5,068,000)	3,484,000
Deferred contract costs	(13,697,000)	(7,714,000)	(11,378,000)
Accounts payable	(35,047,000)	35,397,000	(15,077,000)
Accrued expenses, accrued income taxes, and other liabilities	(25,077,000)	35,817,000	7,450,000
Deferred revenue	(525,000)	3,661,000	(861,000)
Lease obligations	(546,000)	1,041,000	(542,000)
Net cash provided by operating activities	256,106,000	98,292,000	156,743,000
Investing Activities
Purchases of property and equipment	(5,924,000)	(7,713,000)	(2,952,000)
Capitalization of website development costs	(11,346,000)	(6,163,000)	(4,579,000)
Cash paid for acquisitions, net of cash acquired		(64,273,000)	(21,056,000)
Investments in certificates of deposit		(120,000,000)	(100,000,000)
Maturities of certificates of deposit	90,000,000	130,000,000	111,692,000
Net cash provided by (used in) investing activities	72,730,000	(68,149,000)	(16,895,000)
Financing Activities
Proceeds from issuance of common stock upon exercise of stock options	721,000	663,000	1,136,000
Payment of finance lease obligations	(68,000)	(39,000)	(37,000)
Payment of withholding taxes on net share settlements of restricted stock units	(16,022,000)	(15,388,000)	(11,184,000)
Repurchase of common stock	(14,428,000)
Repayment of line of credit		(14,250,000)
Payment of deferred financing costs	(2,578,000)
Payment of tax distributions to redeemable noncontrolling interest holders	(19,913,000)
Change in gross advance payments received from third-party payment processor	(40,332,000)	46,822,000
Net cash (used in) provided by financing activities	(92,620,000)	17,808,000	(10,085,000)
Impact of foreign currency on cash, cash equivalents, and restricted cash	(364,000)	(597,000)	440,000
Net increase in cash, cash equivalents, and restricted cash	235,852,000	47,354,000	130,203,000
Cash, cash equivalents, and restricted cash at beginning of period	248,280,000	200,926,000	70,723,000
Cash, cash equivalents, and restricted cash at end of period	484,132,000	248,280,000	200,926,000
Supplemental disclosure of cash flow information:
Cash paid for income taxes	61,001,000	27,520,000	2,831,000
Cash paid for operating lease liabilities	17,548,000	16,168,000	14,941,000
Cash paid for interest	64,000
Supplemental noncash disclosure of cash flow information:
Unpaid purchases of property and equipment, capitalized website development, capitalized internal-use software and capitalized hosting arrangements	1,927,000	478,000	136,000
Unpaid repurchases of common stock	4,289,000
Capitalized stock-based compensation expense in website development and internal-use software costs and hosting arrangements	4,468,000	3,247,000	$ 1,906,000
Obtaining a right-of-use asset in exchange for a finance lease liability		664,000
Obtaining a right-of-use asset in exchange for an operating lease liability	9,845,000	12,336,000
Issuance of stock for acquisition		103,645,000
Accretion of redeemable noncontrolling interest to redemption value	(109,398,000)	109,398,000
Accrued tax distributions to redeemable noncontrolling interest holders	$ 16,000	$ 8,701,000