Stockholders' Deficit - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Aug. 10, 2020
Class of Stock [Line Items]
Common stock shares authorised	260,000,000		260,000,000		260,000,000
Common stock par or stated value per share	$ 0.001		$ 0.001		$ 0.001
Common stock voting rights					one voting right
Proceeds from the exercise of stock options			$ 205	$ 57
Common Stock [Member]
Class of Stock [Line Items]
Stock options shares excercised during the period	64,562	8,469	64,562	8,469
Subsequent Event [Member]
Class of Stock [Line Items]
Common stock shares authorised						260,000,000
Temporary equity shares authorised						5,000,000
Amended and Restated Certificate of Incorporation [Member]
Class of Stock [Line Items]
Common stock shares authorised					220,000,000
Common stock par or stated value per share					$ 0.001