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Fair Value Measurement of Assets and Liabilities - Summary of Company's Financial Instruments, Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Liabilities:    
Warrant liability $ 9,727 $ 0
Fair Value, Measurements, Recurring [Member]
    
Cash equivalents    
Total cash equivalents 1 487
Available-for-sale:    
Total short-term marketable securities 5,097 19,178
Total long-term marketable securities 261 3,443
Total financial assets 5,359 23,108
Liabilities:    
Warrant liability 9,727  
Fair Value, Measurements, Recurring [Member] | Government Agency Securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 2,351
Total long-term marketable securities 0  
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 980 2,829
Total long-term marketable securities 261 0
Fair Value, Measurements, Recurring [Member] | Certificates of Deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 4,117 3,360
Total long-term marketable securities 0 1,300
Fair Value, Measurements, Recurring [Member] | Corporate Debentures / Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 10,638
Total long-term marketable securities 0 2,143
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
    
Cash equivalents    
Total cash equivalents 1 487
Level 1 [Member]
    
Cash equivalents    
Total cash equivalents 0 0
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Total financial assets 0 0
Liabilities:    
Warrant liability 0  
Level 1 [Member] | Government Agency Securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0  
Level 1 [Member] | Municipal Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 1 [Member] | Certificates of Deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 1 [Member] | Corporate Debentures / Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 1 [Member] | US Treasury Securities [Member]
    
Cash equivalents    
Total cash equivalents 0 0
Level 2 [Member]
    
Cash equivalents    
Total cash equivalents 1 487
Available-for-sale:    
Total short-term marketable securities 5,097 19,178
Total long-term marketable securities 261 3,443
Total financial assets 5,359 23,108
Liabilities:    
Warrant liability 0  
Level 2 [Member] | Government Agency Securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 2,351
Total long-term marketable securities 0  
Level 2 [Member] | Municipal Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 980 2,829
Total long-term marketable securities 261 0
Level 2 [Member] | Certificates of Deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 4,117 3,360
Total long-term marketable securities 0 1,300
Level 2 [Member] | Corporate Debentures / Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 10,638
Total long-term marketable securities 0 2,143
Level 2 [Member] | US Treasury Securities [Member]
    
Cash equivalents    
Total cash equivalents 1 487
Level 3 [Member]
    
Cash equivalents    
Total cash equivalents 0 0
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Total financial assets 0 0
Liabilities:    
Warrant liability 9,727  
Level 3 [Member] | Government Agency Securities [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0  
Level 3 [Member] | Municipal Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 3 [Member] | Certificates of Deposit [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 3 [Member] | Corporate Debentures / Bonds [Member]
    
Available-for-sale:    
Total short-term marketable securities 0 0
Total long-term marketable securities 0 0
Level 3 [Member] | US Treasury Securities [Member]
    
Cash equivalents    
Total cash equivalents $ 0 $ 0