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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:      
Net income (loss) $ 24,844 $ (9,990) $ 9,570
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 9,390 9,879 8,572
Impairment of property and equipment 0 1,098 0
Amortization of intangible assets 15,129 19,683 22,619
Net gains from investments 0 (2,472) (45)
Deferred income taxes (275) (1,677) (3,957)
Stock-based compensation 10,070 10,877 11,684
Operating lease right-of-use assets, amortization, and impairments 11,415 13,397 12,592
Amortization of deferred financing fees 920 981 968
Amortization of discount on investments (65) 0 0
Foreign currency losses (1,439) (582) (933)
Changes in assets and liabilities, net of businesses acquired      
Accounts receivable 3,898 234 3,696
Deferred commissions (6,010) (3,299) (4,643)
Prepaid expenses and other current assets 1,283 423 3,697
Accounts payable 201 109 278
Accrued expenses and other liabilities 20,426 297 4,421
Deferred revenue (36,007) 925 (15,508)
Operating lease liabilities (11,373) (10,577) 10,953
Net cash provided by operating activities 107,067 47,754 48,406
Cash flows from investing activities:      
Acquisitions, net of cash acquired 0 0 (237,684)
Purchases of property and equipment (10,745) (8,905) (11,890)
Purchases of marketable investments (21,607) 0 0
Proceeds from maturities of marketable investments 2,000 0 0
Proceeds from sales of marketable investments 1,000 0 0
Other investing activity 56 4,335 (29)
Net cash provided by (used in) investing activities (29,296) (4,570) 249,545
Cash flows from financing activities:      
Proceeds from borrowings, net of costs 0 0 171,275
Payments on borrowings (34,375) (23,375) (42,250)
Payment of debt issuance costs (494) 0 (857)
Deferred acquisition payments 0 (3,112) 2,799
Repurchases of common stock (20,066) 0 0
Proceeds from issuance of common stock under employee equity incentive plans 9,165 5,706 6,327
Taxes paid for net share settlements of stock-based compensation awards (3,373) (2,906) (2,258)
Net cash provided by (used in) financing activities (49,143) (23,687) 129,438
Effect of exchange rate changes on cash, cash equivalents and restricted cash 1,249 1,963 597
Net increase (decrease) in cash, cash equivalents and restricted cash 27,379 21,460 (71,104)
Cash, cash equivalents and restricted cash, beginning of year 90,652 69,192 140,296
Cash, cash equivalents and restricted cash, end of year 118,031 90,652 69,192
Supplemental disclosure of cash flow information:      
Cash paid for interest 3,279 4,373 7,003
Cash paid for income taxes $ 9,815 $ 3,194 $ 4,433