Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 69,159	$ 48,707
Marketable securities	35,845	39,770
Short-term deposits	41,328	70,438
Trade receivables (net of allowance for doubtful accounts of $655 and $483 at June 30, 2019 and December 31, 2018, respectively)	45,563	83,223
Prepaid expenses and other current assets	15,235	16,952
Total current assets	207,130	259,090
Long-term assets:
Other assets	13,149	8,565
Operating lease right-of-use asset	59,390
Property and equipment, net	24,351	17,323
Total long-term assets	96,890	25,888
Total assets	304,020	284,978
Current liabilities:
Trade payables	2,299	2,620
Accrued expenses and other short term liabilities	53,794	55,991
Deferred revenues	79,078	87,729
Total current liabilities	135,171	146,340
Long-term liabilities:
Deferred revenues	6,119	6,487
Operating lease liability	59,842
Other liabilities	2,694	6,781
Total long-term liabilities	68,655	13,268
Stockholders’ equity:
Common stock of $0.001 par value - Authorized: 200,000,000 shares at June 30, 2019 and December 31, 2018; Issued and outstanding: 30,327,027 shares at June 30, 2019 and 29,576,880 shares at December 31, 2018	30	30
Accumulated other comprehensive income (loss)	258	(3,633)
Additional paid-in capital	285,001	266,941
Accumulated deficit	(185,095)	(137,968)
Total stockholders’ equity	100,194	125,370
Total liabilities and stockholders’ equity	$ 304,020	$ 284,978