Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Detail) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Lease obligation, long-term portion (see Note 5)	$ 1,560,500	$ 1,484,679
Conditional economic incentive grants	250,000	250,000
Other	115,269	130,196
Total other long-term liabilities	$ 1,925,769	$ 1,864,875