Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 64,461	$ 48,707
Marketable securities	37,842	39,770
Short-term deposits	61,328	70,438
Trade receivables (net of allowance for doubtful accounts of $517 and $483 at March 31, 2019 and December 31, 2018, respectively)	41,796	83,223
Prepaid expenses and other current assets	14,899	16,952
Total current assets	220,326	259,090
Long-term assets:
Other assets	12,180	8,565
Operating lease right-of-use asset	51,875
Property and equipment, net	21,065	17,323
Total long-term assets	85,120	25,888
Total assets	305,446	284,978
Current liabilities:
Trade payables	624	2,620
Accrued expenses and other short term liabilities	50,301	55,991
Deferred revenues	81,844	87,729
Total current liabilities	132,769	146,340
Long-term liabilities:
Deferred revenues	6,988	6,487
Operating lease liability	52,697
Other liabilities	2,997	6,781
Total long-term liabilities	62,682	13,268
Stockholders’ equity:
Common stock of $0.001 par value - Authorized: 200,000,000 shares at March 31, 2019 and December 31, 2018; Issued and outstanding: 30,263,237 shares at March 31, 2019 and 29,576,880 shares at December 31, 2018	30	30
Accumulated other comprehensive loss	(688)	(3,633)
Additional paid-in capital	271,260	266,941
Accumulated deficit	(160,607)	(137,968)
Total stockholders’ equity	109,995	125,370
Total liabilities and stockholders’ equity	$ 305,446	$ 284,978