UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 132,771	$ 159,965
Marketable securities	199,401	202,814
Total cash, cash equivalents, and marketable securities	332,172	362,779
Accounts receivable	171,181	182,717
Unbilled receivables	226,052	226,714
Other current assets	74,408	68,008
Total current assets	803,813	840,218
Unbilled receivables	135,975	129,789
Goodwill	82,031	81,923
Other long-term assets	516,661	541,601
Total assets	1,538,480	1,593,531
Current liabilities:
Accounts payable	18,628	15,281
Accrued expenses	63,401	63,890
Accrued compensation and related expenses	54,804	120,946
Deferred revenue	290,873	275,844
Other current liabilities	7,309	9,443
Total current liabilities	435,015	485,404
Convertible senior notes, net	591,440	590,722
Operating lease liabilities	90,699	87,818
Other long-term liabilities	14,658	13,499
Total liabilities	1,131,812	1,177,443
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, 1,000 shares authorized; none issued	0	0
Common stock, 200,000 shares authorized; 81,802 and 81,712 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	818	817
Additional paid-in capital	141,771	145,810
Retained earnings	273,615	276,449
Accumulated other comprehensive (loss)	(9,536)	(6,988)
Total stockholders’ equity	406,668	416,088
Total liabilities and stockholders’ equity	$ 1,538,480	$ 1,593,531