Other Long-Term Liabilities - Summary of Other Long-Term Liabilities (Detail) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Lease obligation, long-term portion (see Note 12)	$ 1,344,779	$ 1,484,679
Common stock warrant liability (see Note 10)	10,000	10,000
Economic conditional grants	250,000	250,000
Other	110,245	120,196
Total other long-term liabilities	$ 1,715,024	$ 1,864,875