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Stockholders' Equity - Additional Information (Detail) - USD ($)		1 Months Ended	4 Months Ended	6 Months Ended
	Jan. 01, 2016	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Equity offering
Aggregate net proceeds from stock sale				$ 22,589,562
Maximum
Incentive plans
Expiration period				10 years
2003 Stock Incentive Plan
Incentive plans
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage				25.00%
Period of vested options shall terminate after termination date				60 days
Expiration period				10 years
Unrecognized compensation expense related to unvested options yet has not been recognized		$ 4,698	$ 4,698	$ 4,698
Period for unrecognized compensation expense related to unvested options yet has not been recognized				1 year
Share based compensation arrangement by share-based payment award options exercises in period, total intrinsic value				$ 87,852	$ 560,676
Fair value of shares vested				12,488	26,656
Cash proceeds from exercise of stock options				$ 37,963	90,537
2013 Equity Incentive Plan
Incentive plans
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage				25.00%
Period of vested options shall terminate after termination date				90 days
Expiration period				10 years
Unrecognized compensation expense related to unvested options yet has not been recognized		$ 5,706,910	$ 5,706,910	$ 5,706,910
Period for unrecognized compensation expense related to unvested options yet has not been recognized				2 years 3 months 18 days
Fair value of shares vested				$ 1,576,879	$ 1,867,672
Shares of common stock reserved for issuance, percentage increase				3.00%
Maximum number of shares that may be issued pursuant to exercise of incentive stock		20,000,000	20,000,000	20,000,000
Weighted-average fair value of the options granted				$ 3.36	$ 5.10
Common Stock | 2013 Equity Incentive Plan
Incentive plans
Common stock authorized under 2013 plan	2,139,701
Shares of common stock reserved for issuance, percentage increase	3.00%
Increase in number of shares of common stock	571,506
Common Stock | 2013 Equity Incentive Plan | Maximum
Incentive plans
Common stock authorized under 2013 plan		1,000,000	1,000,000	1,000,000
At The Market Equity Offering
Equity offering
Stock Issued During Period, Shares, New Issues			477,577
Weighted average price per share issued		$ 6.284	$ 6.284	$ 6.284
Aggregate net proceeds from stock sale			$ 2,700,000
Public Equity Offering (Member)
Equity offering
Stock Issued During Period, Shares, New Issues		3,476,793
Weighted average price per share issued		$ 6.10	$ 6.10	$ 6.10
Aggregate net proceeds from stock sale		$ 19,800,000

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Share based compensation arrangement by share based payment award number of maximum shares issued upon exercise of incentive stock options.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Per share or per unit amount of equity securities issued.

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