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Fair Values on Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair value of financial assets and liabilities    
Total financial assets $ 98,821 $ 33,426
Total financial liabilities 2,424 10,485
Money market funds    
Fair value of financial assets and liabilities    
Total financial assets 42,169 [1] 3,912 [2]
Corporate debt securities    
Fair value of financial assets and liabilities    
Total financial assets 18,965 [3] 26,088 [4]
United States government agency securities    
Fair value of financial assets and liabilities    
Total financial assets 30,003 [3] 3,426 [4]
Aduro equity securities    
Fair value of financial assets and liabilities    
Total financial assets [5] 7,684  
2010 Warrant Liability    
Fair value of financial assets and liabilities    
Total financial liabilities 2,424 [6] 10,485 [7]
Level 1    
Fair value of financial assets and liabilities    
Total financial assets 49,853 3,912
Level 1 | Money market funds    
Fair value of financial assets and liabilities    
Total financial assets 42,169 [1] 3,912 [2]
Level 1 | Aduro equity securities    
Fair value of financial assets and liabilities    
Total financial assets [5] 7,684  
Level 2    
Fair value of financial assets and liabilities    
Total financial assets 48,968 29,514
Level 2 | Corporate debt securities    
Fair value of financial assets and liabilities    
Total financial assets 18,965 [3] 26,088 [4]
Level 2 | United States government agency securities    
Fair value of financial assets and liabilities    
Total financial assets 30,003 [3] 3,426 [4]
Level 3    
Fair value of financial assets and liabilities    
Total financial liabilities 2,424 10,485
Level 3 | 2010 Warrant Liability    
Fair value of financial assets and liabilities    
Total financial liabilities $ 2,424 [6] $ 10,485 [7]
[1] Included in cash and cash equivalents on the Company's unaudited condensed consolidated balance sheets.
[2] Included in cash and cash equivalents on the Company's consolidated balance sheets.
[3] Included in short-term investments on the Company's unaudited condensed consolidated balance sheets.
[4] Included in short-term investments on the Company's consolidated balance sheets, except for approximately $1.0 million of corporate debt securities that are included in cash and cash equivalents on the Company's consolidated balance sheets.
[5] Included in investment in marketable equity securities on the Company's unaudited condensed consolidated balance sheets.
[6] Included in current liabilities on the Company's unaudited condensed consolidated balance sheets.
[7] Included in current liabilities on the Company's consolidated balance sheets.