Acquisition of Confluence (Tables) - Confluence

6 Months Ended

Jun. 30, 2018

Business Acquisition [Line Items]

Schedule of Consideration Transferred

Cash consideration paid	$	10,269
Aclaris common stock issued		9,675
Contingent consideration		4,378
Total fair value of consideration to Confluence equity holders	$	24,322

Schedule of Pro Forma Information

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
Revenue	$	3,676	$	1,067	$	4,794	$	2,303
Gross profit		995		243		1,146		805
Total operating expenses		32,973		16,133		64,072		29,449
Net loss		(31,218)		(15,432)		(61,447)		(28,106)