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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended				9 Months Ended
	Jan. 08, 2018	Jan. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stockholders Equity Note [Line Items]
Net proceeds from public offering							$ 76,547	$ 17,803
Common Stock
Stockholders Equity Note [Line Items]
Common stock, number of shares issued			1,471,000	17,867,000	1,471,000	1,978,000
Underwritten Public Offering | Common Stock
Stockholders Equity Note [Line Items]
Net proceeds from public offering		$ 62,700
Common stock, shares issued and sold		16,866,667
Common stock, par value		$ 0.001
Common stock, sale of stock, price per share		$ 3.75
Cantor Fitzgerald & Co | Amendment No. 3 | Sales Agreement
Stockholders Equity Note [Line Items]
Percentage of proceeds payable as compensation to underwriter	2.00%
Common stock, number of shares issued							2,500,000
Net proceeds from public offering							$ 13,900

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