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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents $ 21,739 $ 18,401
Short-term bank deposits 34,432 46,247
Marketable securities (Note 2) 82,664 61,868
Trade receivables 16,494 15,044
Prepaid expenses and other current assets 3,747 3,152
Total current assets 159,076 144,712
Long-term assets:    
Bank deposits 44,518 29,977
Severance pay fund 8,910 7,941
Deferred tax assets (Note 12) 3,643 2,252
Property and equipment, net (Note 4) 6,926 4,805
Goodwill 46,612 46,612
Intangible assets, net (Note 5) 1,742 2,978
Investments in other company 1,806 1,806
Other long-term assets 3,579 1,412
Total long-term assets 117,736 97,783
Total assets 276,812 242,495
Current liabilities:    
Trade payables 392 571
Deferred revenues 4,399 6,258
Accrued expenses and other payables (Note 6) 3,927 4,015
Accrued payroll and related benefits 14,077 11,751
Total current liabilities 22,795 22,595
Long-term liabilities:    
Accrued severance pay 9,347 8,349
Total long-term liabilities 9,347 8,349
Stockholders' equity (Note 7):    
Preferred stock: $0.001 par value: 5,000,000 shares authorized; none issued and outstanding
Common stock: $0.001 par value: 60,000,000 shares authorized; 23,595,160 shares issued at December 31, 2016 and 2017; 21,273,500 and 22,064,007 shares outstanding at December 31, 2016 and 2017, respectively 22 21
Additional paid in-capital 217,417 212,103
Treasury stock at cost (2,321,660 and 1,531,153 shares of common stock at December 31, 2016 and 2017, respectively) (26,056) (39,507)
Accumulated other comprehensive loss (Note 9) (586) (497)
Retained earnings 53,873 39,431
Total stockholders' equity 244,670 211,551
Total liabilities and stockholders' equity $ 276,812 $ 242,495