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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 38,858 $ 44,812
Marketable securities available-for-sale 127,989 151,313
Accounts receivable 1,164 1,394
Prepaid expenses and other current assets 2,728 2,427
Total current assets 170,739 199,946
Property and equipment, net 15,894 13,804
Goodwill 2,127 2,043
Restricted cash 617 609
Other assets 267 231
Total assets 189,644 216,633
Current liabilities:    
Accounts payable 3,476 3,433
Accrued research and development 6,027 7,361
Accrued liabilities 13,251 15,337
Deferred revenues 1,759 2,654
Total current liabilities 24,513 28,785
Other long-term liabilities 700 769
Total liabilities $ 25,213 $ 29,554
Commitments and contingencies (Note 4)
Stockholders’ equity:    
Preferred stock: $0.001 par value; 5,000 shares authorized at March 31, 2016 and December 31, 2015; no shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively
Common stock: $0.001 par value; 69,500 shares authorized at March 31, 2016 and December 31, 2015; 38,496 and 38,446 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively $ 38 $ 38
Additional paid-in capital 893,278 889,698
Accumulated other comprehensive loss (2,135) (2,930)
Accumulated deficit (726,750) (699,727)
Total stockholders’ equity 164,431 187,079
Total liabilities and stockholders’ equity $ 189,644 $ 216,633