Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 49,241	$ 76,593
Short-term Investments	57,103	35,102
Trade receivables (net of allowance for doubtful accounts of $ 156 and $ 149 at December 31, 2015 and at December 31, 2014, respectively)	47,436	37,869
Prepaid expenses and other current assets	2,622	2,962
Total current assets	156,402	152,526
Long-term assets:
Other assets	477	332
Property and equipment, net	8,265	3,989
Total long-term assets	8,742	4,321
Total assets	165,144	156,847
Current liabilities:
Trade payables	2,612	2,703
Accrued expenses and other short term liabilities	23,029	16,754
Deferred revenues	45,675	33,753
Total current liabilities	71,316	53,210
Long-term liabilities:
Deferred revenues	3,096	3,464
Severance pay	1,528	1,449
Other liabilities	5,617	3,698
Total long-term liabilities	10,241	8,611
Stockholders’ equity:
Common stock of $ 0.001 par value—Authorized: 200,000,000 shares at December 31, 2015 and 2014; Issued and outstanding: 26,069,154 shares at December 31, 2015 and 24,685,604 shares at December 31, 2014	26	25
Accumulated other comprehensive loss	(331)	(326)
Additional paid-in capital	172,326	162,478
Accumulated deficit	(88,434)	(67,151)
Total stockholders’ equity	83,587	95,026
Total liabilities and stockholders’ equity	$ 165,144	$ 156,847