Organization and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Entity incorporation, date of incorporation	Jun. 17, 2009
Accumulated deficit	$ (227,799)	$ (177,974)
Cash and cash equivalents	$ 215,256	$ 139,045