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Stockholders' Equity (Common Stock are Reserved for Future Issuance) (Detail) - shares
shares in Thousands
Jun. 30, 2016
Dec. 31, 2015
Equity [Abstract]    
Warrants outstanding 37,418 22,308
Stock options outstanding 10,309 13,262
Options reserved for future issuance under the Company's 2007 Incentive Plan 10,923  
Shares reserved for future issuance under the Employee Stock Purchase Plan 461  
Total reserved for future issuance 59,111