Nature of Business And Basics of Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands					6 Months Ended
	Sep. 03, 2020 USD ($) shares	Aug. 31, 2020 USD ($)	Aug. 11, 2020 USD ($) $ / shares shares	Jul. 31, 2020	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs					$ 82,544	$ 10,949
Cash and cash equivalents					$ 80,289		$ 4,185
Series C Redeemable Convertible Preferred Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Shares Issued, Price Per Share | $ / shares					$ 1.6016
Proceeds from initial public offering gross					$ 75,000
Common Stock [Member] | Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Reverse stock split, conversion ratio				7.4771
Description of the reverse stock split arrangement				On July 31, 2020, the Company effected a one-for-7.4771 reverse stock split of its common stock. Upon the effectiveness of the reverse stock split, (i) all shares of outstanding common stock were adjusted; (ii) the number of shares of common stock for which each outstanding option to purchase common stock is exercisable were adjusted; and (iii) the exercise price of each outstanding option to purchase common stock were adjusted. All of the outstanding common stock share numbers (including shares of common stock subject to the Company's options and as converted for the outstanding convertible preferred stock shares), share prices, exercise prices and per share amounts contained in the interim unaudited condensed financial statements have been retroactively adjusted in the interim condensed financial statements to reflect this reverse stock split for all periods presented. The par value per share and the authorized number of shares of common stock were not adjusted as a result of the reverse stock split. The reverse stock split resulted in an adjustment to the redeemable convertible preferred stock conversion prices to reflect a proportional decrease in the number of shares of common stock to be issued upon conversion.
Proceeds from initial public offering			$ 67,000
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs		$ 68,500
IPO [Member] | Common Stock [Member] | Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Shares Issued During Period | shares			5,000,000
Shares Issued, Price Per Share | $ / shares			$ 15.00
Over-Allotment Option [Member] | Common Stock [Member] | Subsequent Event [Member]
Subsidiary, Sale of Stock [Line Items]
Shares Issued During Period | shares	109,861
Sale of stock consideration received on the transaction	$ 1,500