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 loss	$ (46,677)	$ (42,731)	$ (99,013)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Deferred income taxes	(10,468)	161	4,243
Depreciation and amortization	16,170	10,633	6,880
Stock-based compensation	79,405	59,573	41,610
Other	3,915	1,071	(784)
Changes in operating assets and liabilities:
Accounts receivable	(17,228)	(20,012)	(25,941)
Prepaid expenses and other assets	(46,207)	(19,372)	(16,954)
Accounts payable, accrued expenses and accrued compensation	24,330	(5,282)	10,513
Deferred revenue	92,486	71,383	72,799
Other current and noncurrent liabilities	1,039	8,808	(4,097)
Net cash provided by (used in) operating activities	96,765	64,232	(10,744)
Cash flows from investing activities:
Purchases of property and equipment	(6,561)	(20,277)	(20,674)
Purchases of short-term investments	(282,438)	(184,516)	(242,059)
Sales and maturities of short-term investments	160,874	209,148	224,594
Purchase of other investments	(5,000)	0	0
Business combinations, net of cash acquired	(258,465)	(276)	(74,911)
Net cash (used in) provided by investing activities	(391,590)	4,079	(113,050)
Cash flows from financing activities:
Proceeds from term loan	375,000	0	0
Credit facility issuance costs	(9,348)	(333)	0
Proceeds from loan agreement	0	2,000	0
Proceeds from stock issued in connection with the employee stock purchase plan	13,736	13,040	15,129
Proceeds from the exercise of stock options	18,268	21,709	19,048
Other financing activities	(10)	(13)	(16)
Net cash provided by financing activities	397,646	36,403	34,161
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(3,013)	(916)	(1,080)
Net increase (decrease) in cash and cash equivalents and restricted cash	99,808	103,798	(90,713)
Cash and cash equivalents and restricted cash at beginning of year	178,463	74,665	165,378
Cash and cash equivalents and restricted cash at end of year	278,271	178,463	74,665
Supplemental disclosure of cash flow information:
Cash paid for interest	4,978	335	96
Cash paid for income taxes, net of refunds	6,481	5,729	8,530
Supplemental cash flow information related to leases:
Cash payments for operating leases	$ 7,657	$ 8,807	$ 4,452