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Equity Instruments - Summary of Stock Options Outstanding and Exercisable (Detail)
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding and Exercisable | shares 6,845,832
Weighted Average Exercise Price $ 3.78
Weighted Average Remaining Contractual Lives 5 years 2 months 23 days
$1.03 - $4.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Lower $ 1.03
Range of Exercise Prices Upper $ 4.00
Number of Options Outstanding and Exercisable | shares 4,670,832
Weighted Average Exercise Price $ 2.35
Weighted Average Remaining Contractual Lives 4 years 10 months 28 days
$4.01 - $7.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Lower $ 4.01
Range of Exercise Prices Upper $ 7.00
Number of Options Outstanding and Exercisable | shares 1,240,000
Weighted Average Exercise Price $ 6.17
Weighted Average Remaining Contractual Lives 5 years 4 months 21 days
$7.01 - $8.93 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Lower $ 7.01
Range of Exercise Prices Upper $ 8.93
Number of Options Outstanding and Exercisable | shares 935,000
Weighted Average Exercise Price $ 7.73
Weighted Average Remaining Contractual Lives 6 years 6 months 29 days