The Company - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Net loss	$ 44,540	$ 24,076
Accumulated deficit	162,028		$ 117,488
Cash and cash equivalents and short term investments	$ 199,400
Reverse stock split	one-for-8.4335