Supplementary Data – Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The following table represents certain unaudited financial information for each of the quarters ended December 31, 2019 and 2018

	Three Months Ended
(in thousands, except per share data)	December 31, 2019			September 30, 2019			June 30, 2019			March 31, 2019
Revenue	$	11,305		$	12,277		$	10,525		$	8,629
Net loss	$	(14,789	)	$	(12,912	)	$	(13,793	)	$	(14,250	)
Net loss per share, basic and diluted	$	(0.65	)	$	(0.56	)	$	(0.60	)	$	(0.62	)

	Three Months Ended
(in thousands, except per share data)	December 31, 2018			September 30, 2018			June 30, 2018			March 31, 2018
Revenue	$	19,086		$	7,836		$	5,704		$	5,793
Net loss	$	(1,493	)	$	(10,237	)	$	(11,541	)	$	(12,046	)
Net loss per share attributable to    common stockholders, basic and diluted	$	(0.07	)	$	(21.26	)	$	(24.17	)	$	(25.76	)