Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 781,357	$ 234,092
Marketable securities	20,035	34,117
Short-term deposits	12,276	30,053
Trade receivables (net of allowances of $1,737 and $1,250 at June 30, 2021 and December 31, 2020, respectively)	60,145	94,229
Prepaid expenses and other current assets	23,143	27,357
Total current assets	896,956	419,848
Long-term assets:
Operating lease right-of-use asset	52,554	47,924
Property and equipment, net	34,621	37,163
Intangible assets, net	5,078	5,846
Goodwill	23,135	23,135
Other assets	19,988	21,566
Total long-term assets	135,376	135,634
Total assets	1,032,332	555,482
Current liabilities:
Trade payables	3,167	850
Accrued expenses and other short-term liabilities	91,973	83,198
Deferred revenues	86,421	98,588
Total current liabilities	181,561	182,636
Long-term liabilities:
Convertible senior notes, net	221,857	218,460
Operating lease liability	52,720	54,540
Deferred revenues	2,052	2,778
Other liabilities	3,756	2,997
Total long-term liabilities	280,385	278,775
Stockholders’ equity:
Common stock of $0.001 par value - Authorized: 200,000,000 shares at June 30, 2021 and December 31, 2020; Issued and outstanding: 106,914,031 shares at June 30, 2021 and 95,456,862 shares at December 31, 2020	107	95
Accumulated other comprehensive income	3,093	9,371
Additional paid-in capital	946,532	395,347
Accumulated deficit	(379,346)	(310,742)
Total stockholders’ equity	570,386	94,071
Total liabilities and stockholders’ equity	$ 1,032,332	$ 555,482