Selected Quarterly Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Summary of the Quarterly Results of Operations

The following is a summary of the quarterly results of operations for the years ended December 31, 2020 and 2019:

	2020
	March 31		June 30		September 30		December 31
Research and development expenses	$	13,750	$	12,720	$	18,841	$	17,473
General and administrative expenses	4,998		6,289		6,643		8,022
Loss from operations	(18,748)		(19,009)		(25,484)		(25,495)
Net income (loss) attributable to common stockholders	$	(15,076)	$	(18,589)	$	(25,450)	$	(25,432)
Basic earnings (loss) per common share	$	(0.28)	$	(0.32)	$	(0.27)	$	(0.27)
Diluted earnings (loss) per common share	$	(0.28)	$	(0.32)	$	(0.27)	$	(0.27)

	2019
	March 31		June 30		September 30		December 31
Research and development expenses	$	7,685	$	10,009	$	10,383	$	11,567
General and administrative expenses	5,481		5,198		4,674		6,275
Income (loss) from operations	(13,166)		(15,207)		(15,057)		(17,842)
Net income (loss) attributable to common stockholders	$	(12,501)	$	(14,443)	$	(14,437)	$	(17,478)
Basic earnings (loss) per common share	$	(0.30)	$	(0.35)	$	(0.35)	$	(0.39)
Diluted earnings (loss) per common share	$	(0.30)	$	(0.35)	$	(0.35)	$	(0.39)