Description of Business and Basis of Presentation - Additional Information (Detail)		3 Months Ended
	Feb. 18, 2020 USD ($)	Mar. 31, 2020 USD ($) Subsidiary	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Basis Of Presentation [Line Items]
Number of Subsidiaries | Subsidiary		3
Net loss incurred		$ 3,169,000	$ 6,002,000
Cash used in operations		1,353,000	$ 3,011,000
Net proceeds upon completion of underwritten public offering	$ 14,800,000	15,036,000
Cash and cash equivalents		11,786,000		$ 3,633,000
Outstanding borrowings under revolving line of credit				$ 3,123,000
Revolving Credit Facility [Member]
Basis Of Presentation [Line Items]
Outstanding borrowings under revolving line of credit		0
Letters of credit outstanding		1,200,000
Amount available under revolving line of credit		$ 8,800,000
Existing maturity date		Apr. 28, 2021