Description of Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Jul. 02, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2018 shares
Class Of Stock [Line Items]
Common stock, shares authorized		155,649,887	145,467,774
Offering expenses | $		$ 3,057
Redeemable convertible preferred stock outstanding		114,960,357	104,778,246
Initial Public Offering
Class Of Stock [Line Items]
Number of common stock issued		17,250,000
Net proceeds from issuance of initial public offering | $		$ 320,900
Offering expenses | $		$ 5,300
Description of reverse stock split		On June 13, 2019 the Company effected a reverse split of shares of the Company’s common stock on a 1-for-2 basis
Reverse stock split ratio		0.5
Initial Public Offering | The RealReal Foundation
Class Of Stock [Line Items]
Donation payable | $		$ 3,200
Initial Public Offering | Subsequent Event
Class Of Stock [Line Items]
Number of common stock issued	15,000,000
Common stock issued price per share | $ / shares	$ 20.00
Net proceeds from issuance of initial public offering | $	$ 320,900
Underwriting discounts and commissions | $	$ 24,100
Common stock, shares authorized	500,000,000
Undesignated preferred stock, shares authorized for issuance	50,000,000
Redeemable convertible preferred stock outstanding	114,960,357
Convertible preferred stock converted into common stock	58,363,606
Initial Public Offering | Subsequent Event | Common Stock Warrants
Class Of Stock [Line Items]
Conversion of preferred stock warrants into common stock warrants	103,563
Underwriters’ Option to Purchase Additional Shares | Subsequent Event
Class Of Stock [Line Items]
Number of common stock issued	2,250,000
Common stock issued price per share | $ / shares	$ 20.00