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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 10,768 $ 6,030
Marketable securities 203,462 172,932
Interest receivable 393 423
Accounts receivable 5,179 10,368
Prepaid expenses 1,089 623
Restricted cash   320
Other current assets 114 183
Total current assets 221,005 190,879
Marketable securities, non-current 3,948 47,260
Property and equipment, net 3,217 1,479
Intangible assets, in-process research and development   1,870
Goodwill 1,585 1,585
Other assets 193 139
Total assets 229,948 243,212
Current liabilities:    
Accounts payable and accrued liabilities 9,512 8,704
Accrued compensation and employee benefits 2,020 2,853
Escrow liability   275
Deferred revenues 9,524 9,050
Total current liabilities 21,056 20,882
Deferred revenues, non-current 8,948 13,149
Contingent consideration liability   1,800
Deferred tax liability   748
Total liabilities $ 30,004 $ 36,579
Commitments and contingencies    
Stockholders' equity:    
Common stock, $0.01 par value; 160,000,000 shares authorized, 69,802,697 and 69,062,394 shares issued and outstanding at June 30, 2015, and December 31, 2014, respectively $ 698 $ 690
Additional paid-in capital 545,244 534,518
Accumulated deficit (345,995) (328,550)
Accumulated other comprehensive loss (3) (25)
Total stockholders' equity 199,944 206,633
Total liabilities and stockholders' equity $ 229,948 $ 243,212