Common Stock - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Feb. 28, 2019	Mar. 31, 2019	Mar. 31, 2018
Class of Stock [Line Items]
Net proceeds from issuance of common stock	$ 5,600,000
Net withheld for employee taxes		45,459	17,570
Underwritten Public Offering [Member]
Class of Stock [Line Items]
Proceeds from offering costs, shares		4,542,500
Net proceeds from issuance of common stock		$ 5,649,000
Underwriter Warrants [Member]
Class of Stock [Line Items]
Warrants to purchase common stock		363,400
Common stock warrants, exercise price per share		$ 1.75
Restricted Stock [Member]
Class of Stock [Line Items]
Number of shares, Vested		10,436
Restricted Stock Units [Member]
Class of Stock [Line Items]
Number of shares, Vested		95,001
Net withheld for employee taxes		45,459