Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 48,315	$ 49,241
Short-term Investments	65,493	57,103
Trade receivables (net of allowance for doubtful accounts of $ 372 and $ 156 at December 31, 2016 and at December 31, 2015, respectively)	53,861	47,436
Prepaid expenses and other current assets	3,650	2,622
Total current assets	171,319	156,402
Long-term assets:
Other assets	609	477
Property and equipment, net	9,910	8,265
Total long-term assets	10,519	8,742
Total assets	181,838	165,144
Current liabilities:
Trade payables	1,288	2,612
Accrued expenses and other short term liabilities	28,479	23,029
Deferred revenues	58,478	45,675
Total current liabilities	88,245	71,316
Long-term liabilities:
Deferred revenues	3,562	3,096
Severance pay	1,664	1,528
Other liabilities	5,628	5,617
Total long-term liabilities	10,854	10,241
Stockholders’ equity:
Common stock of $ 0.001 par value—Authorized: 200,000,000 shares at December 31, 2016 and 2015; Issued and outstanding: 26,821,762 shares at December 31, 2016 and 26,069,154 shares at December 31, 2015	27	26
Accumulated other comprehensive loss	(479)	(331)
Additional paid-in capital	189,335	172,326
Accumulated deficit	(106,144)	(88,434)
Total stockholders’ equity	82,739	83,587
Total liabilities and stockholders’ equity	$ 181,838	$ 165,144