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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 24,787 $ 44,812
Marketable securities available-for-sale 114,202 151,313
Accounts and other receivables 1,864 1,394
Prepaid expenses and other current assets 6,273 2,427
Total current assets 147,126 199,946
Property and equipment, net 17,448 13,804
Goodwill 2,080 2,043
Restricted cash 613 609
Other assets 346 231
Total assets 167,613 216,633
Current liabilities:    
Accounts payable 4,486 3,433
Accrued research and development 5,273 7,361
Accrued liabilities 18,464 15,337
Deferred revenues   2,654
Total current liabilities 28,223 28,785
Other long-term liabilities 620 769
Total liabilities 28,843 29,554
Commitments and contingencies (Note 4)
Stockholders’ equity:    
Preferred stock: $0.001 par value; 5,000 shares authorized at June 30, 2016 and December 31, 2015; no shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively
Common stock: $0.001 par value; 69,500 shares authorized at June 30, 2016 and December 31, 2015; 38,497 and 38,446 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively 38 38
Additional paid-in capital 897,027 889,698
Accumulated other comprehensive loss (2,559) (2,930)
Accumulated deficit (755,736) (699,727)
Total stockholders’ equity 138,770 187,079
Total liabilities and stockholders’ equity $ 167,613 $ 216,633