Information Related to Stock Options (Detail) (USD $) | 6 Months Ended |
Jun. 30, 2014 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | ' |
Options Outstanding, Number of Options | 8,709,000 |
Options Exercisable, Weighted Average Remaining Life In Years | '7 years 4 months 24 days |
Options Exercisable, Exercisable Number of Options | 5,323,167 |
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 | '10 years |
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 | 0.39 |
Options Outstanding, Number of Options | 60,000 |
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 | 0.5 |
Options Outstanding, Number of Options | 345,000 |
Options Exercisable, Weighted Average Remaining Life In Years | '5 years 4 months 24 days |
Options Exercisable, Exercisable Number of Options | 332,500 |
Exercise Price 4 | ' |
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 | '9 years 8 months 12 days |
Options Exercisable, Exercisable Number of Options | 40,000 |
Exercise Price 5 | ' |
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 | '9 years 3 months 18 days |
Options Exercisable, Exercisable Number of Options | 490,000 |
Exercise Price 6 | ' |
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 | '5 years 7 months 6 days |
Options Exercisable, Exercisable Number of Options | 791,667 |
Exercise Price 7 | ' |
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 | '8 years 1 month 6 days |
Options Exercisable, Exercisable Number of Options | 81,000 |
Exercise Price 8 | ' |
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 | '7 years 7 months 6 days |
Options Exercisable, Exercisable Number of Options | 2,270,000 |
Exercise Price 9 | ' |
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 10 months 24 days |
Options Exercisable, Exercisable Number of Options | 5,000 |
Exercise price 10 | ' |
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 10 months 24 days |
Options Exercisable, Exercisable Number of Options | 10,000 |
Exercise Price 11 | ' |
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 | '2 years 4 months 24 days |
Options Exercisable, Exercisable Number of Options | 43,000 |
Exercise Price 12 | ' |
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 | '5 years 4 months 24 days |
Options Exercisable, Exercisable Number of Options | 160,000 |
Exercise Price 13 | ' |
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 | '8 years 4 months 24 days |
Options Exercisable, Exercisable Number of Options | 900,000 |