Preferred Stock, Common Stock and Stockholders' Equity - Warrants - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Sale Of Stock [Line Items]
Change in fair value of warrant liability		$ 433,392		$ 433,392
Warrants outstanding to purchase common stock			2,713,561	2,713,561
Weighted average exercise price of warrants			$ 2.91	$ 2.91
Weighted average remaining contractual term of outstanding warrants			2 years 14 days	2 years 14 days
Warrant Amendments [Member]
Sale Of Stock [Line Items]
Unregistered warrants to purchase of common stock		2,449,129
Change in fair value of warrant liability		$ 433,000
Reclassification of warrant liability to Additional Paid-in Capital		$ 3,300,000
Amendment date		2018-03
Underwriters [Member]
Sale Of Stock [Line Items]
Unregistered warrants to purchase of common stock expired	84,000