Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 239,979	$ 68,929
Marketable securities	26,116	41,531
Short-term deposits	60,000	10,000
Trade receivables (net of allowance for doubtful accounts of $862 and $637 at June 30, 2020 and December 31, 2019, respectively)	48,766	75,050
Prepaid expenses and other current assets	15,568	13,047
Total current assets	390,429	208,557
Long-term assets:
Other assets	20,007	18,360
Operating lease right-of-use asset	51,294	55,057
Property and equipment, net	36,566	36,338
Total long-term assets	107,867	109,755
Total assets	498,296	318,312
Current liabilities:
Trade payables	678	997
Accrued expenses and other short-term liabilities	65,094	62,607
Deferred revenues	79,129	95,975
Total current liabilities	144,901	159,579
Long-term liabilities:
Convertible senior notes, net	215,144	0
Deferred revenues	3,692	5,460
Operating lease liability	53,539	57,040
Other liabilities	2,490	2,701
Total long-term liabilities	274,865	65,201
Stockholders’ equity:
Common stock of $0.001 par value - Authorized: 200,000,000 shares at June 30, 2020 and December 31, 2019; Issued and outstanding: 31,543,519 shares at June 30, 2020 and 30,583,311 shares at December 31, 2019	32	31
Accumulated other comprehensive income (loss)	3,536	(449)
Additional paid-in capital	347,447	310,682
Accumulated deficit	(272,485)	(216,732)
Total stockholders’ equity	78,530	93,532
Total liabilities and stockholders’ equity	$ 498,296	$ 318,312