Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 21, 2018	Dec. 31, 2019	Dec. 31, 2018
Class Of Stock [Line Items]
Net proceeds from issuance of common stock excluding underwriting costs and other offering related costs		$ 1,217	$ 4,098
Common stock, shares authorized	400,000,000	400,000,000	400,000,000
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Common stock, par value	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, par value	$ 0.0001	$ 0.0001	$ 0.0001
Common Stock
Class Of Stock [Line Items]
Common stock issued			9,200,000
IPO
Class Of Stock [Line Items]
Common stock issued	9,200,000
Common stock offering price	$ 15.00
Net proceeds from issuance of common stock excluding underwriting costs and other offering related costs	$ 124,700
IPO | Common Stock
Class Of Stock [Line Items]
Convertible preferred stock converted into common stock	30,459,574
Overallotment
Class Of Stock [Line Items]
Common stock issued	1,200,000