Statement of Stockholders' (Deficit) Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity
Common Stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
IPO
Increase (Decrease) in Stockholders' Equity
Issuance costs		$ (5,417)
Private Placement
Increase (Decrease) in Stockholders' Equity
Issuance costs	$ (41)	$ (1,667)
Secondary Public Offering
Increase (Decrease) in Stockholders' Equity
Issuance costs	$ (714)
Common Stock
Increase (Decrease) in Stockholders' Equity
Common Stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Additional Paid-in Capital | Private Placement
Increase (Decrease) in Stockholders' Equity
Issuance costs	$ (41)