Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Information about Company's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

Fair Value Measurements - Information about Company's Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Marketable securities	$ 10,526,228us-gaap_MarketableSecuritiesCurrent	$ 1,670,606us-gaap_MarketableSecuritiesCurrent
Warrant liability	525,059us-gaap_DerivativeLiabilitiesNoncurrent	313,004us-gaap_DerivativeLiabilitiesNoncurrent
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash equivalents	11,942,431	25,628,918
Marketable securities	10,526,228	1,670,606
Total	22,468,659	27,299,524
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Warrant liability	525,059	313,004
Total	$ 525,059	$ 313,004

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References + Details