Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 53,539	$ 48,315
Short-term investments	68,039	65,493
Trade receivables (net of allowance for doubtful accounts of $420 and $372 at June 30, 2017 and December 31, 2016, respectively)	41,313	53,861
Prepaid expenses and other current assets	7,571	3,650
Total current assets	170,462	171,319
Long-term assets:
Other assets	818	609
Property and equipment, net	11,160	9,910
Total long-term assets	11,978	10,519
Total assets	182,440	181,838
Current liabilities:
Trade payables	1,348	1,288
Accrued expenses and other short term liabilities	30,769	28,479
Deferred revenues	57,457	58,478
Total current liabilities	89,574	88,245
Long-term liabilities:
Deferred revenues	3,889	3,562
Severance pay	1,472	1,664
Other liabilities	5,273	5,628
Total long-term liabilities	10,634	10,854
Stockholders’ equity:
Common stock of $0.001 par value - Authorized: 200,000,000 shares at June 30, 2017 and December 31, 2016; Issued and outstanding: 27,468,395 shares at June 30, 2017 and 26,821,762 shares at December 31, 2016	27	27
Accumulated other comprehensive income (loss)	2,128	(479)
Additional paid-in capital	204,751	189,335
Accumulated deficit	(124,674)	(106,144)
Total stockholders’ equity	82,232	82,739
Total liabilities and stockholders’ equity	$ 182,440	$ 181,838