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Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 87,715 $ 86,553
Accounts receivable, net of allowance for doubtful accounts of $958 and $730 at September 30, 2016 and December 31, 2015, respectively 38,286 44,164
Prepaid expenses and other current assets 6,705 6,148
Total current assets 132,706 136,865
Property and equipment, net 8,009 7,532
Goodwill 75,110 74,565
Intangible assets, net 9,450 11,385
Other assets 760 214
Total assets 226,035 230,561
Current liabilities:    
Accounts payable 2,675 2,038
Accrued expenses 22,226 24,707
Deferred revenue, current portion 104,663 87,917
Other current liabilities 1,352 1,105
Total current liabilities 130,916 115,767
Deferred revenue, non-current portion 44,601 42,400
Other long-term liabilities 2,872 4,319
Total liabilities 178,389 162,486
Stockholders' equity:    
Preferred stock, $0.01 par value per share; 10,000,000 shares authorized at September 30, 2016 and December 31, 2015; 0 shares issued at September 30, 2016 and December 31, 2015
Common stock, $0.01 par value per share; 100,000,000 shares authorized at September 30, 2016 and December 31, 2015; 42,929,120 and 41,942,026 shares issued at September 30, 2016 and December 31, 2015, respectively; 42,480,491 and 41,540,400 shares outstanding at September 30, 2016 and December 31, 2015, respectively 425 415
Additional paid-in-capital 430,939 411,524
Accumulated deficit (379,564) (340,338)
Treasury stock, at cost, 448,629 and 401,626 shares at September 30, 2016 and December 31, 2015, respectively (4,154) (3,526)
Total stockholders' equity 47,646 68,075
Total liabilities and stockholders' equity $ 226,035 $ 230,561