Organization and Business (Narrative) (Details) $ / shares in Units, $ in Thousands				3 Months Ended						9 Months Ended
	Sep. 30, 2021 USD ($) shares	Apr. 13, 2021 USD ($) $ / shares shares	Apr. 05, 2021	Sep. 30, 2021 USD ($) shares	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Apr. 14, 2021 shares	Dec. 31, 2020 USD ($) shares
Stock split reverse description			On April 5, 2021, the Company effected a 1-for-4.4748 reverse stock split of its common stock. The par value and the authorized number of shares of the common stock were not adjusted as a result of the reverse stock split. The reverse stock split resulted in an adjustment to the Series A and Series B convertible preferred stock conversion prices to reflect a proportional decrease in the number of shares of common stock to be issued upon conversion. The accompanying condensed consolidated financial statements and notes to the condensed consolidated financial statements give retroactive effect to the reverse stock split for all periods presented.
Stock split reverse conversion ratio			0.2235
Preferred stock, shares outstanding | shares	0			0						0			0
Proceeds from private financings	$ 230,600
Cash, cash equivalents at carrying value and short term investments	157,700			$ 157,700						$ 157,700
Accumulated deficit	$ 74,121			74,121						74,121			$ 44,958
Net loss				$ 12,735	$ 9,216	$ 7,212	$ 5,094	$ 3,687	$ 4,431	29,163	$ 13,212
Cash used for operating activities										$ 27,962	$ 13,125
IPO [Member]
Common stock issued, Shares | shares		6,250,000
Share price | $ / shares		$ 15.00
Proceeds from issuance initial public offering		$ 93,800
Initial public offering underwriting discounts and commissions		6,600
Initial public offering offering expenses		$ 2,600
Shares issued from conversion of convertible stock | shares		15,907,629
Convertible preferred stock [Member]
Preferred stock, shares outstanding | shares		71,183,500										0