Formation and Business of the Company (Details) $ / shares in Units, $ in Thousands		1 Months Ended			12 Months Ended
	Mar. 13, 2019	May 31, 2020 USD ($) $ / shares shares	Aug. 31, 2019 $ / shares shares	Apr. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Subsequent Event [Line Items]
Accumulated deficit					$ 238,891	$ 191,526
Cash and cash equivalents					69,466	39,181
Available-for-sale investments					78,016
Reverse stock split	0.3704
Payments of deferred offering costs					$ 4,457	233
IPO
Subsequent Event [Line Items]
Issued and sold common stock (in shares) | shares				6,000,000
Net proceeds				$ 109,119
Stock issued, price per share (in USD per share) | $ / shares				$ 20.00	$ 20.00
Payments of deferred offering costs				$ 2,481		$ 10,961
Payment of stock issuance underwriting discounts and commissions				$ 8,400
Second Public Offering
Subsequent Event [Line Items]
Issued and sold common stock (in shares) | shares			4,200,000
Stock issued, price per share (in USD per share) | $ / shares			$ 39.50
Over-Allotment Option
Subsequent Event [Line Items]
Issued and sold common stock (in shares) | shares		1,021,223	630,000
Net proceeds		$ 70,543
Payments of deferred offering costs		707
Payment of stock issuance underwriting discounts and commissions		$ 3,750
Public Stock Offering
Subsequent Event [Line Items]
Issued and sold common stock (in shares) | shares		6,808,154
Stock issued, price per share (in USD per share) | $ / shares		$ 39.00
Public Stock Offering - Shares From Company
Subsequent Event [Line Items]
Issued and sold common stock (in shares) | shares		1,923,076
Public Stock Offering - Shares From Existing Shareholders
Subsequent Event [Line Items]
Issued and sold common stock (in shares) | shares		4,885,078