Quarterly report pursuant to Section 13 or 15(d)

Summary of Option Activity (Detail)

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Summary of Option Activity (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Number of Shares    
Beginning Balance 3,391,000  
Granted 3,096,000  
Exercised (38,000)  
Forfeited, cancelled, or expired (329,000)  
Ending Balance 6,120,000 3,391,000
Options exercisable, June 30, 2015 2,862,000  
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod 113,000  
Weighted Average Exercise Price    
Beginning Balance $ 3.11  
Granted 2.35  
Exercised 1.15  
Forfeited, cancelled, or expired 3.16  
Ending Balance 2.74 $ 3.11
Options exercisable, June 30, 2015 3.05  
ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice $ 3.09  
Weighted Average Remaining Contractual Term (In Years)    
Options outstanding 5 years 11 months 12 days 2 years 11 months 19 days
Options exercisable 2 years 7 months 21 days  
Aggregate Intrinsic Value    
Options outstanding [1] $ 1,063,000  
Options outstanding [1] 113,000 $ 1,063,000
Options exercisable [1] $ 94,000  
[1] The intrinsic value calculation does not include negative values. This can occur when the fair market value on the reporting date is less than the exercise price of the grant.