CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common Stock | Incyte
Issuance costs		$ 100
Common Stock | Convertible Preferred Stock
Conversion ratio of series A stock into common stock	1000.00%
Common Stock | At The Market
Issuance costs	$ 100	107
Common Stock | Private Placement
Issuance costs			$ 2,400
Common Stock | Follow On Offering
Issuance costs	4,600	$ 3,300
Series A Convertible Preferred Stock
Issuance costs	$ 400