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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 12,955 $ 69,482
Marketable securities 159,321 139,518
Interest receivable 299 307
Accounts receivable 2,305 2,521
Prepaid expenses 1,270 754
Total current assets 176,150 212,582
Property and equipment, net 3,025 2,916
Goodwill 1,585 1,585
Other assets 146 152
Total assets 180,906 217,235
Current liabilities:    
Accounts payable and accrued liabilities 7,014 8,229
Accrued compensation and employee benefits 2,202 2,748
Deferred revenues 5,244 9,120
Total current liabilities 14,460 20,097
Deferred revenues, non-current 6,176 4,699
Build-to-suit lease obligation 247  
Total liabilities 20,883 24,796
Commitments and contingencies
Stockholders' equity:    
Common stock, $0.01 par value; 160,000,000 shares authorized, 70,606,263 and 70,354,608 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively 706 703
Additional paid-in capital 571,548 560,989
Accumulated deficit (412,322) (369,253)
Accumulated other comprehensive income 91  
Total stockholders' equity 160,023 192,439
Total liabilities and stockholders' equity $ 180,906 $ 217,235