Organization (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 14, 2020	Mar. 31, 2020	Dec. 31, 2019
Organization
Common stock issued and sold in public offering (in shares)	11,691,666
Public offering price of the shares sold	$ 3.00
Proceeds from public offering, net of underwriters' discounts	$ 33,300	$ 33,672
Cash and cash equivalents		$ 121,020	$ 98,849
Expected period of sufficient funds for planned operations		12 months