Consolidated Balance Sheets - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 349,051	$ 485,928
Accounts receivable and unbilled receivables, net of allowances of $5,272 and $4,286, respectively	240,894	190,117
Inventories	119,924	96,298
Prepaid expenses	22,499	16,027
Other current assets	48,334	41,044
Total current assets	780,702	829,414
Property and equipment, net	71,141	59,073
Long-term investment in sales-type leases, net	18,391	22,156
Operating lease right-of-use assets	48,549	55,114
Goodwill	738,900	499,309
Intangible assets, net	277,616	168,211
Long-term deferred tax assets	15,883	15,019
Prepaid commissions	63,795	56,919
Other long-term assets	127,519	119,289
Total assets	2,142,496	1,824,504
Current liabilities:
Accounts payable	71,513	40,309
Accrued compensation	71,130	55,750
Accrued liabilities	133,167	80,311
Deferred revenues, net	112,196	100,053
Convertible senior notes, net	488,152	0
Total current liabilities	876,158	276,423
Long-term deferred revenues	20,194	5,673
Long-term deferred tax liabilities	51,705	39,633
Long-term operating lease liabilities	39,911	48,897
Other long-term liabilities	7,839	19,174
Convertible senior notes, net	0	467,201
Total liabilities	995,807	857,001
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued	0	0
Common stock, $0.001 par value, 100,000 shares authorized; 54,073 and 52,677 shares issued; 44,179 and 42,783 shares outstanding, respectively	54	53
Treasury stock at cost, 9,894 shares outstanding, respectively	(238,109)	(238,109)
Additional paid-in capital	1,024,580	920,359
Retained earnings	368,571	290,722
Accumulated other comprehensive loss	(8,407)	(5,522)
Total stockholders’ equity	1,146,689	967,503
Total liabilities and stockholders’ equity	$ 2,142,496	$ 1,824,504
Treasury stock, shares outstanding (in shares)	9,894	9,894