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Stockholders' Equity - Additional Information (Detail) - USD ($)				1 Months Ended	3 Months Ended
	Mar. 31, 2016	Mar. 28, 2016	Jan. 01, 2016	May. 02, 2016	Mar. 31, 2016	Mar. 31, 2015
Equity offering
Stock Issued During Period, Shares, New Issues		206,500
Weighted average price per share issued		$ 6.299
Proceeds from Issuance of Common Stock		$ 1,300,000
Net proceeds from stock issuance and sale		1,100,000			$ 1,238,619
Stock issuance expenses including commissions		$ 200,000
Subsequent Event
Equity offering
Stock Issued During Period, Shares, New Issues				142,177
Net proceeds from stock issuance and sale				$ 864,756
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	$ 9,648				$ 9,648
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					75,093	$ 473,016
Fair value of shares vested					7,412	13,785
Cash proceeds from exercise of stock options					$ 35,891	75,377
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	$ 6,154,795				$ 6,154,795
Period for unrecognized compensation expense related to unvested options yet has not been recognized					2 years 7 months 6 days
Fair value of shares vested					$ 1,056,200	$ 1,252,769
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
Weighted-average fair value of the options granted					$ 3.21	$ 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

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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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