Stock Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from exercise of stock options			$ 693,398	$ 537,962
Stock options to purchase shares of common stock	11,790,335		11,790,335
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted, expiration Period	7 years	7 years	7 years	7 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-vested stock compensation awards granted under the Plan	$ 1,200,000		$ 1,200,000
Expected remaining weighted average vesting period			2 years 2 months 12 days
Non-cash stock-based compensation expense	$ 131,884	$ 0	$ 434,920	$ 0
Common stock granted	0	0	30,000	0
Options to Purchase Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options exercised	215,097	108,332	240,096	298,332
Proceeds from exercise of stock options	$ 631,048	$ 256,062	$ 693,398	$ 537,962
Common stock unit granted	10,000	172,500	1,005,000	484,500
Unrecognized compensation expense related to non-vested stock compensation awards granted under the Plan	$ 7,800,000		$ 7,800,000
Expected remaining weighted average vesting period			2 years 1 month 6 days
Non-cash stock-based compensation expense	$ 1,345,962	$ 817,060	$ 4,356,739	$ 2,675,467
Stock option vested during the period	348,163	74,998	1,542,992	1,365,827
Stock options to purchase shares of common stock	6,833,809		6,833,809
Common stock shares available for future issuance under the Plan	3,444		3,444
Options to Purchase Common Stock [Member] | Cashless Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options exercised on cashless basis		6,666