Stock-Based Compensation - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($) shares	Sep. 30, 2017 USD ($) shares
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option Vesting Period		4 years
Stock option Expiration Period		10 years
Unrecognized compensation cost, stock options | $	$ 2,227,080	$ 2,227,080
Unrecognized stock-based compensation expense, period for recognition		2 years 5 months 12 days
Common stock issued as result of option exercises	200,060	200,657
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense, period for recognition		1 year 10 months 10 days
Unvested restricted stock, shares	25,559	25,559
Unrecognized compensation expense | $	$ 33,618	$ 33,618
Common stock issued as result of vesting of restricted stock	2,130	48,987