Condensed Statements of Redeemable Convertible Preferred Stock And Stockholders' Deficit (Parenthetical) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares
Cash paid for redeemable convertible preferred stock issuance	$ 398	$ 0
Series B Redeemable Convertible Preferred Stock [Member]
Shares Issued, Price Per Share | $ / shares	$ 2.1687	$ 2.1687
Cash paid for redeemable convertible preferred stock issuance	$ 27	$ 51
Series C Redeemable Convertible Preferred Stock [Member]
Shares Issued, Price Per Share | $ / shares	$ 1.6016
Cash paid for redeemable convertible preferred stock issuance	$ 429