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Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Detail)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Equity [Abstract]    
Warrants outstanding 8,540 14,850
Stock options outstanding 8,994 13,159
Options reserved for future issuance under the Company's 2007 Incentive Plan 2,484  
Shares reserved for future issuance under the Employee Stock Purchase Plan 642  
Total reserved for future issuance 20,660