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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flow from operating activities:    
Net income $ 25,410 $ 228
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 8,982 9,078
Bad debt expense 141 138
Loss on disposal of property and equipment 5 0
Stock-based compensation 11,745 38,202
Amortization of premiums on marketable securities 762 967
Deferred income taxes (5,095) (5,162)
Changes in operating assets and liabilities:    
Accounts receivable 19,563 14,819
Prepaid expenses and other assets 6,067 (6,083)
Accounts payable 599 107
Accrued liabilities 3,435 1,686
Deferred revenues 7,426 3,874
Net cash provided by operating activities 79,040 57,854
Cash flow from investing activities:    
Purchases of marketable securities (81,800) (115,610)
Sales and maturities of marketable securities 84,915 145,044
Purchases of property and equipment (7,639) (6,259)
Net cash provided by (used in) investing activities (4,524) 23,175
Cash flow from financing activities:    
Repurchases of common stock (46,581) (31,029)
Proceeds from exercise of stock options 2,569 2,264
Payments for taxes related to net share settlement of equity awards (3,631) (17,643)
Proceeds from issuance of common stock through employee stock purchase plan 2,086 0
Net cash used in financing activities (45,557) (46,408)
Net increase in cash, cash equivalents and restricted cash 28,959 34,621
Cash, cash equivalents and restricted cash at beginning of period 138,528 75,332
Cash, cash equivalents and restricted cash at end of period $ 167,487 $ 109,953