BUSINESS COMBINATION (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Dec. 18, 2020 USD ($) $ / shares shares	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Business Combination [Line Items]
PIPE share conversion ratio	1
Equity issuance costs		$ 28,876	$ 0
Transaction with Social Capital Hedosophia Holdings Corp. II I Common Stock
Business Combination [Line Items]
Consideration received due to reverse recapitalization	$ 376,600
PIPE shares issued by Social Capital Hedosophia Holdings Corp. II | shares	60,005,000
Common stock price per PIPE Shares (in usd per share) | $ / shares	$ 10.00
Total PIPE shares investment	$ 600,100
Exchange ratio upon Business Combination with Social Capital Hedosophia Holdings Corp. II	1.618
Opendoor Technologies Inc. Common Stock | Common Stock Warrants
Business Combination [Line Items]
Equity issuance costs	$ 43,600