Organization and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands				3 Months Ended				6 Months Ended		12 Months Ended
	Jul. 30, 2020 USD ($) shares	Jul. 28, 2020 $ / shares shares	Jul. 17, 2020	Jun. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares
Organization And Basis Of Presentation [Line Items]
Number of common stock issued upon conversion | shares				12,843,940				12,843,940		9,690,393
Net loss | $				$ 9,473	$ 7,738	$ 4,173	$ 4,971	$ 17,211	$ 9,144	$ 19,700
Accumulated deficit | $				51,863				51,863		34,652
Cash and cash equivalents | $				50,863		$ 45,136		50,863	$ 45,136	31,605
Short-term investments | $				$ 13,004				$ 13,004		$ 15,527
Subsequent Event
Organization And Basis Of Presentation [Line Items]
Reverse stock split of common stock			0.1338
Stockholders' equity, reverse stock split			one-for-7.4730 reverse stock split
Net proceeds issuance of common stock, deducting underwriting discounts and commissions | $	$ 116,500
Number of outstanding preferred stock converted | shares		104,277,222
Number of common stock issued upon conversion | shares		13,953,850
Subsequent Event | IPO
Organization And Basis Of Presentation [Line Items]
Shares issued | shares		7,000,000
Shares issued, price per share | $ / shares		$ 16.00
Subsequent Event | Underwriters
Organization And Basis Of Presentation [Line Items]
Shares issued | shares	1,050,000