Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Selected Quarterly Financial Information [Abstract]

Summary of Unaudited Quarterly Financial Data

The following tables summarize the unaudited quarterly financial data for the last two fiscal years (in thousands, except per share/unit data):

	2020
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenue	$	1,358		$	1,541		$	1,746		$	2,142
Operating expenses		7,508			11,909			13,212			18,435
Other income (expense)		65			(188	)		27			18
Net loss		(6,085	)		(10,556	)		(11,439	)		(16,275	)
Net loss per share, basic and diluted (1)		(2.14	)		(1.23	)		(0.31	)		(0.43	)

	2019
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Revenue	$	—		$	224		$	650		$	1,445
Operating expenses		2,174			4,129			5,856			7,492
Other income (expense)		(375	)		(1,211	)		(1,462	)		(4,354	)
Net loss		(2,549	)		(5,116	)		(6,668	)		(10,401	)
Net loss per share/unit, basic and diluted (1)		(0.97	)		(1.89	)		(2.43	)		(3.75	)

(1) Net loss per share/unit is computed independently for each quarter and the full year based upon respective shares/units outstanding; therefore, the sum of the quarterly net loss per share/unit amounts may not equal the annual amounts reported.