Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 753,606	$ 234,092
Marketable securities	28,080	34,117
Short-term deposits	42,284	30,053
Trade receivables (net of allowances of $1,527 and $1,250 at March 31, 2021 and December 31, 2020, respectively)	51,302	94,229
Prepaid expenses and other current assets	24,564	27,357
Total current assets	899,836	419,848
Long-term assets:
Operating lease right-of-use asset	54,000	47,924
Property and equipment, net	35,930	37,163
Intangible assets, net	5,462	5,846
Goodwill	23,135	23,135
Other assets	19,444	21,566
Total long-term assets	137,971	135,634
Total assets	1,037,807	555,482
Current liabilities:
Trade payables	637	850
Accrued expenses and other short-term liabilities	87,026	83,198
Deferred revenues	91,596	98,588
Total current liabilities	179,259	182,636
Long-term liabilities:
Convertible senior notes, net	220,149	218,460
Operating lease liability	54,383	54,540
Deferred revenues	2,152	2,778
Other liabilities	3,274	2,997
Total long-term liabilities	279,958	278,775
Stockholders’ equity:
Common stock of $0.001 par value - Authorized: 200,000,000 shares at March 31, 2021 and December 31, 2020; Issued and outstanding: 106,147,395 shares at March 31, 2021 and 95,456,862 shares at December 31, 2020	106	95
Accumulated other comprehensive income	4,191	9,371
Additional paid-in capital	920,691	395,347
Accumulated deficit	(346,398)	(310,742)
Total stockholders’ equity	578,590	94,071
Total liabilities and stockholders’ equity	$ 1,037,807	$ 555,482