Information Related to Stock Options (Detail) (USD $) | 3 Months Ended |
Mar. 31, 2015 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Number of Options | 16,184,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 7 years 6 months |
Options Exercisable, Exercisable Number of Options | 7,196,502 |
Exercise Price 1 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.285 |
Options Outstanding, Number of Options | 900,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 9 years 2 months 12 days |
Options Exercisable, Exercisable Number of Options | 200,000 |
Exercise Price 2 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.32 |
Options Outstanding, Number of Options | 500,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 0 years |
Options Exercisable, Exercisable Number of Options | 0 |
Exercise Price 3 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.33 |
Options Outstanding, Number of Options | 6,125,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 4 years 6 months |
Options Exercisable, Exercisable Number of Options | 75,000 |
Exercise Price 4 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.34 |
Options Outstanding, Number of Options | 250,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 0 years |
Options Exercisable, Exercisable Number of Options | 0 |
Exercise Price 5 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.39 |
Options Outstanding, Number of Options | 60,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 4 years 2 months 12 days |
Options Exercisable, Exercisable Number of Options | 60,000 |
Exercise Price 6 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.46 |
Options Outstanding, Number of Options | 500,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 0 years |
Options Exercisable, Exercisable Number of Options | 0 |
Exercise Price 7 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.47 |
Options Outstanding, Number of Options | 100,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 4 years 9 months 18 days |
Options Exercisable, Exercisable Number of Options | 87,500 |
Exercise Price 8 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.5 |
Options Outstanding, Number of Options | 345,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 4 years 7 months 6 days |
Options Exercisable, Exercisable Number of Options | 345,000 |
Exercise Price 9 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.53 |
Options Outstanding, Number of Options | 40,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 8 years 10 months 24 days |
Options Exercisable, Exercisable Number of Options | 40,000 |
Exercise price 10 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.6 |
Options Outstanding, Number of Options | 980,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 8 years 6 months |
Options Exercisable, Exercisable Number of Options | 980,000 |
Exercise Price 11 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 0.65 |
Options Outstanding, Number of Options | 2,675,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 8 years 7 months 6 days |
Options Exercisable, Exercisable Number of Options | 1,850,002 |
Exercise Price 12 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 1 |
Options Outstanding, Number of Options | 131,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 7 years 8 months 12 days |
Options Exercisable, Exercisable Number of Options | 131,000 |
Exercise Price 13 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 1.05 |
Options Outstanding, Number of Options | 2,270,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 6 years 10 months 24 days |
Options Exercisable, Exercisable Number of Options | 2,270,000 |
Exercise Price 14 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 1.1 |
Options Outstanding, Number of Options | 5,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 2 years 2 months 12 days |
Options Exercisable, Exercisable Number of Options | 5,000 |
Exercise Price 15 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 1.2 |
Options Outstanding, Number of Options | 10,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 1 year 2 months 12 days |
Options Exercisable, Exercisable Number of Options | 10,000 |
Exercise price 16 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 1.25 |
Options Outstanding, Number of Options | 43,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 1 year 7 months 6 days |
Options Exercisable, Exercisable Number of Options | 43,000 |
Exercise Price 17 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 1.4 |
Options Outstanding, Number of Options | 350,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 4 years 3 months 18 days |
Options Exercisable, Exercisable Number of Options | 200,000 |
Exercise Price 18 | |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |
Options Outstanding, Exercise Price | 1.5 |
Options Outstanding, Number of Options | 900,000 |
Options Exercisable, Weighted Average Remaining Life In Years | 7 years 8 months 12 days |
Options Exercisable, Exercisable Number of Options | 900,000 |