Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) - USD ($) $ in Thousands	SeriesA and Series B Redeemable Convertible Preferred Stock Common Stock	SeriesA and Series B Redeemable Convertible Preferred Stock Additional Paid-in Capital	SeriesA and Series B Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Comprehensive Income (loss)	Accumulated Deficit	Total
Balance at beginning of period at Dec. 31, 2017					$ 50		$ (25)	$ 25
Balance at beginning of period (shares) at Dec. 31, 2017				2,286,200
Increase (Decrease) in Stockholders' Equity
Beneficial conversion feature related to related party convertible notes					401			401
Issuance of common stock in exchange for process research and development					1,815			1,815
Issuance of common stock in exchange for process research and development (in shares)				2,880,612
Foreign currency translation adjustment						$ 2		2
Net loss							(15,529)	(15,529)
Balance at end of period at Dec. 31, 2018					2,266	2	(15,554)	(13,286)
Balance at end of period (shares) at Dec. 31, 2018				5,166,812
Increase (Decrease) in Stockholders' Equity
Conversion of related party convertible notes into common stock					651			651
Conversion of related party convertible notes into common stock (in shares)				1,565,300
Exercise of stock options					1			1
Exercise of stock options (in shares)				1,143
Conversion of Series A and B redeemable convertible preferred stock into common stock	$ 1	$ 40,911	$ 40,912
Conversion of Series A and B redeemable convertible preferred stock into common stock (in shares)	8,264,613
Extinguishment of related party convertible notes net of substantial premium					732			732
Stock–based compensation					118			118
Issuance of common stock and warrants to former Gemphire stockholders and effect of reverse asset acquisition				$ 15	4,451			4,466
Issuance of common stock and warrants to former Gemphire stockholders and effect of reverse asset acquisition (in shares)				594,850
Foreign currency translation adjustment						10		10
Net loss							(21,312)	(21,312)
Balance at end of period at Dec. 31, 2019				$ 16	$ 49,130	$ 12	$ (36,866)	$ 12,292
Balance at end of period (shares) at Dec. 31, 2019				15,592,718