Common Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	May 20, 2019	Jun. 30, 2019	Sep. 30, 2019
Subsidiary Sale Of Stock [Line Items]
Net proceeds from offering			$ 42,509
Common stock
Subsidiary Sale Of Stock [Line Items]
Number of shares issued	4,717,949	4,718,000
Shares issued upon exercise of underwriters option	615,384
Price per share	$ 9.75
Gross proceeds from offering	$ 46,000
Net proceeds from offering	$ 42,500