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Fair Value on Financial Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair value of financial assets and liabilities    
Total financial assets $ 27,463 $ 36,841
Total financial liabilities 7,653 20,390
Money market funds
    
Fair value of financial assets and liabilities    
Total financial assets 6,329 [1] 8,650 [1]
Corporate debt securities
    
Fair value of financial assets and liabilities    
Total financial assets 17,700 [2] 23,173 [2]
United States government agency securities
    
Fair value of financial assets and liabilities    
Total financial assets 3,434 [2] 5,018 [2]
Warrant Liability
    
Fair value of financial assets and liabilities    
Total financial liabilities 7,653 [3] 20,390 [3]
Level 1
    
Fair value of financial assets and liabilities    
Total financial assets 6,329 8,650
Total financial liabilities 0 0
Level 1 | Money market funds
    
Fair value of financial assets and liabilities    
Total financial assets 6,329 [1] 8,650 [1]
Level 1 | Corporate debt securities
    
Fair value of financial assets and liabilities    
Total financial assets 0 [2] 0 [2]
Level 1 | United States government agency securities
    
Fair value of financial assets and liabilities    
Total financial assets 0 [2] 0 [2]
Level 1 | Warrant Liability
    
Fair value of financial assets and liabilities    
Total financial liabilities 0 [3] 0 [3]
Level 2
    
Fair value of financial assets and liabilities    
Total financial assets 21,134 28,191
Total financial liabilities 0 0
Level 2 | Money market funds
    
Fair value of financial assets and liabilities    
Total financial assets 0 [1] 0 [1]
Level 2 | Corporate debt securities
    
Fair value of financial assets and liabilities    
Total financial assets 17,700 [2] 23,173 [2]
Level 2 | United States government agency securities
    
Fair value of financial assets and liabilities    
Total financial assets 3,434 [2] 5,018 [2]
Level 2 | Warrant Liability
    
Fair value of financial assets and liabilities    
Total financial liabilities 0 [3] 0 [3]
Level 3
    
Fair value of financial assets and liabilities    
Total financial assets 0 0
Total financial liabilities 7,653 20,390
Level 3 | Money market funds
    
Fair value of financial assets and liabilities    
Total financial assets 0 [1] 0 [1]
Level 3 | Corporate debt securities
    
Fair value of financial assets and liabilities    
Total financial assets 0 [2] 0 [2]
Level 3 | United States government agency securities
    
Fair value of financial assets and liabilities    
Total financial assets 0 [2] 0 [2]
Level 3 | Warrant Liability
    
Fair value of financial assets and liabilities    
Total financial liabilities $ 7,653 [3] $ 20,390 [3]
[1] Included in cash and cash equivalents on the Company's condensed consolidated balance sheets.
[2] Included in short-term investments on the Company's condensed consolidated balance sheets.
[3] Included in current liabilities on the Company's condensed consolidated balance sheets.