Consolidated Balance Sheets (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 77,919	$ 76,593
Short-term deposits	35,102	35,102
Trade receivables (net of allowance for doubtful accounts of $149 at March 31, 2015 and December 31, 2014)	20,643	37,869
Prepaid expenses and other current assets	2,354	2,962
Total current assets	136,018	152,526
Long-term assets:
Other assets	326	332
Property and equipment, net	5,474	3,989
Total long-term assets	5,800	4,321
Total assets	141,818	156,847
Current liabilities:
Trade payables	2,122	2,703
Accrued expenses and other liabilities	14,480	16,754
Deferred revenues	31,891	33,753
Total current liabilities	48,493	53,210
Long-term liabilities:
Deferred revenues	3,225	3,464
Severance pay	1,449	1,449
Other liabilities	4,182	3,698
Total long-term liabilities	8,856	8,611
Share capital
Common stock of $ 0.001 par value - Authorized: 200,000,000 shares at March 31, 2015 and December 31, 2014; Issued and outstanding: 24,844,646 shares at March 31, 2015 and 24,685,604 shares at December 31, 2014	25	25
Accumulated other comprehensive loss	(446)	(326)
Additional paid-in capital	164,711	162,478
Accumulated deficit	(79,821)	(67,151)
Total stockholders’ equity	84,469	95,026
Total liabilities and stockholders’ equity	$ 141,818	$ 156,847