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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating Activities      
Consolidated net income $ 22,053,000 $ 78,954,000 $ 110,373,000
Adjustments to reconcile consolidated net income to net cash provided by operating activities:      
Depreciation and amortization 48,474,000 45,334,000 40,476,000
Gain on sale of property and equipment (460,000)    
Currency (gain) loss on foreign denominated transactions (283,000) 155,000 (70,000)
Other non-cash expense, net 88,000    
Deferred taxes (37,864,000) (22,114,000) 6,163,000
Provision for doubtful accounts 378,000 1,769,000 999,000
Stock-based compensation expense 63,737,000 54,777,000 53,525,000
Amortization of deferred financing costs 515,000 136,000 0
Amortization of deferred contract costs 11,817,000 11,067,000 12,653,000
Impairment of long-lived assets 184,000 165,000 3,128,000
Changes in operating assets and liabilities:      
Accounts receivable 10,975,000 152,954,000 (174,771,000)
Inventory 1,958,000 14,374,000 (17,318,000)
Prepaid expenses, prepaid income taxes, and other assets (1,498,000) (6,573,000) (5,068,000)
Deferred contract costs (18,440,000) (13,697,000) (7,714,000)
Accounts payable 2,080,000 (35,047,000) 35,397,000
Accrued expenses, accrued income taxes, and other liabilities (3,419,000) (25,077,000) 35,817,000
Deferred revenue 9,067,000 (525,000) 3,661,000
Lease obligations 15,165,000 (546,000) 1,041,000
Net cash provided by operating activities 124,527,000 256,106,000 98,292,000
Investing Activities      
Purchases of property and equipment (24,563,000) (5,924,000) (7,713,000)
Proceeds from sale of property and equipment 460,000    
Capitalization of website development costs (16,648,000) (11,346,000) (6,163,000)
Cash paid for acquisitions, net of cash acquired     (64,273,000)
Purchases of short-term investments (98,016,000)   (120,000,000)
Maturities of short-term investments   90,000,000 130,000,000
Sale of short-term investments 77,462,000    
Advance payments to customers, net of collections (259,000)    
Net cash (used in) provided by investing activities (61,564,000) 72,730,000 (68,149,000)
Financing Activities      
Proceeds from issuance of common stock upon exercise of stock options 74,000 721,000 663,000
Payment of finance lease obligations (70,000) (68,000) (39,000)
Payment of withholding taxes on net share settlements of restricted stock units (15,597,000) (16,022,000) (15,388,000)
Repurchase of common stock (208,524,000) (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 (38,000) (19,913,000)  
Acquisition of remaining interest in CarOffer, LLC (25,014,000)    
Change in gross advance payments received from third-party transaction processor (4,475,000) (40,332,000) 46,822,000
Net cash (used in) provided by financing activities (253,644,000) (92,620,000) 17,808,000
Impact of foreign currency on cash, cash equivalents, and restricted cash 475,000 (364,000) (597,000)
Net (decrease) increase in cash, cash equivalents, and restricted cash (190,206,000) 235,852,000 47,354,000
Cash, cash equivalents, and restricted cash at beginning of period 484,132,000 248,280,000 200,926,000
Cash, cash equivalents, and restricted cash at end of period 293,926,000 484,132,000 248,280,000
Supplemental disclosure of cash flow information:      
Cash paid for income taxes 74,783,000 61,001,000 27,520,000
Cash paid for operating lease liabilities 19,504,000 17,548,000 16,168,000
Cash paid for interest 566,000 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 18,149,000 1,927,000 478,000
Unpaid repurchases of common stock   4,289,000  
Unpaid excise tax on repurchases of shares 1,584,000    
Capitalized stock-based compensation expense in website development and internal-use software costs and hosting arrangements 5,472,000 4,468,000 3,247,000
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 $ 149,185,000 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