Organization and Nature of Operations - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Common stock, par value	$ 0.0001		$ 0.0001
Common stock, shares authorized	300,000,000		300,000,000
Preferred stock, par value	$ 0.0001		$ 0.0001
Preferred stock, shares authorized	10,000,000		10,000,000
Accumulated deficit	$ 142,758		$ 117,157
Net cash used in operating activities	18,890	$ 23,601	33,200
Cash and cash equivalents	$ 33,646		$ 14,584