Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Summary of Selected Unaudited Consolidated Quarterly Financial Information

The selected consolidated quarterly financial results from operations for the years ended December 31, 2018 and 2017 are set forth therein.

	Fiscal 2018 Quarter Ended
	March 31, 2018			June 30, 2018			September 30, 2018			December 31, 2018
	(in thousands, except per share amounts)
Operating expenses	$	11,754		$	12,963		$	16,051		$	14,649
Net loss(1)	$	(11,525	)	$	(11,960	)	$	(15,567	)	$	(14,283	)
Basic and diluted net loss per share	$	(0.19	)	$	(0.16	)	$	(0.21	)	$	(0.19	)

	Fiscal 2017 Quarter Ended
	March 31, 2017			June 30, 2017			September 30, 2017			December 31, 2017
	(in thousands, except per share amounts)
Operating expenses	$	11,154		$	10,477		$	10,183		$	10,805
Net loss(1)	$	(11,092	)	$	(10,329	)	$	(9,995	)	$	(10,599	)
Basic and diluted net loss per share	$	(0.26	)	$	(0.20	)	$	(0.19	)	$	(0.20	)

(1) Net loss from continuing operations and net loss attributable to common stockholders are the same as net loss for all periods presented.