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Common Stock - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 93 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 3 Months Ended | 3 Months Ended | 93 Months Ended | 3 Months Ended | 93 Months Ended | |||||||
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Apr. 30, 2013
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Mar. 31, 2014
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Mar. 31, 2013
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Mar. 31, 2014
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Feb. 28, 2014
Executive Vice Chairman [Member]
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Dec. 19, 2013
Executive Vice Chairman [Member]
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Mar. 31, 2014
Executive Vice Chairman [Member]
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Dec. 31, 2013
Executive Vice Chairman [Member]
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Feb. 20, 2014
Executive Vice Chairman [Member]
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Mar. 31, 2014
Executive Vice Chairman [Member]
Restricted Stock [Member]
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Dec. 31, 2013
Executive Vice Chairman [Member]
Restricted Stock [Member]
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Mar. 31, 2014
Director [Member]
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Feb. 20, 2014
Director [Member]
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Mar. 31, 2014
Board Of Directors [Member]
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Feb. 20, 2014
Board Of Directors [Member]
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Mar. 31, 2014
Research and Development Expense [Member]
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Mar. 31, 2013
Research and Development Expense [Member]
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Mar. 31, 2014
Research and Development Expense [Member]
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Mar. 31, 2014
General and Administrative Expense [Member]
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Mar. 31, 2013
General and Administrative Expense [Member]
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Mar. 31, 2014
General and Administrative Expense [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||
| Stock Issuance, Maximum Amount Of Proceeds Approved | $ 45,000,000 | ||||||||||||||||||||
| Audit Costs | 32,000 | ||||||||||||||||||||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | 2,400,000 | 2,400,000 | |||||||||||||||||||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | 18,500,000 | 18,500,000 | |||||||||||||||||||
| Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock Options Period For Recognition | 1 year 2 months 12 days | ||||||||||||||||||||
| Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Other Than Options Period For Recognition | 3 years 9 months 18 days | ||||||||||||||||||||
| Stock Issued During Period Shares warrants Exercised | 8,415 | ||||||||||||||||||||
| CashLess Exercise Of Warrants | 18,724 | ||||||||||||||||||||
| Warrants Exercise Price | $ 4.97 | ||||||||||||||||||||
| Employee Benefits And Share Based Compensation | 1,135,000 | 1,523,000 | 14,549,000 | 400,000 | 800,000 | 7,900,000 | 800,000 | 700,000 | 6,600,000 | ||||||||||||
| Officers Compensation | 28,275 | ||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 3,958,692 | 1,979,346 | 30,000 | 50,000 | |||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 10,600,000 | 3,800,000 | 500,000 | ||||||||||||||||||
| Share Price | $ 1.93 | $ 2.69 | $ 2.69 | $ 2.69 | |||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 10.00% | 16.67% | |||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 5 years | 3 years | |||||||||||||||||||
| Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 80,700 | ||||||||||||||||||||