Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 77,533	$ 68,929
Marketable securities	33,737	41,531
Short-term deposits	15,000	10,000
Trade receivables (net of allowance for doubtful accounts of $614 and $637 at March 31, 2020 and December 31, 2019, respectively)	38,265	75,050
Prepaid expenses and other current assets	12,764	13,047
Total current assets	177,299	208,557
Long-term assets:
Other assets	19,026	18,360
Operating lease right-of-use asset	53,808	55,057
Property and equipment, net	36,849	36,338
Total long-term assets	109,683	109,755
Total assets	286,982	318,312
Current liabilities:
Trade payables	823	997
Accrued expenses and other short-term liabilities	59,994	62,607
Deferred revenues	84,331	95,975
Total current liabilities	145,148	159,579
Long-term liabilities:
Deferred revenues	4,501	5,460
Operating lease liability	54,580	57,040
Other liabilities	2,712	2,701
Total long-term liabilities	61,793	65,201
Stockholders’ equity:
Common stock of $0.001 par value - Authorized: 200,000,000 shares at March 31, 2020 and December 31, 2019; Issued and outstanding: 31,466,270 shares at March 31, 2020 and 30,583,311 shares at December 31, 2019	31	31
Accumulated other comprehensive income (loss)	291	(449)
Additional paid-in capital	327,881	310,682
Accumulated deficit	(248,162)	(216,732)
Total stockholders’ equity	80,041	93,532
Total liabilities and stockholders’ equity	$ 286,982	$ 318,312