Common Stock of ROIC (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Feb. 20, 2020	Jul. 31, 2013
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001		$ 0.0001
Proceeds from the sale of common stock		$ 25,199,000	$ 46,061,000
Stock issuance costs		$ 553,000	$ 500,000
Stock repurchase program, authorized amount						$ 50,000,000
Repurchase of common stock (in shares)		0
Sales Agreement
Class of Stock [Line Items]
Common stock, par value (in dollars per share)					$ 0.0001
Common shares that may be sold under a sales agreement, aggregate offering price, maximum					$ 500,000,000
Common stock issued, in shares	0	1,288,213
Proceeds from the sale of common stock		$ 25,200,000
Stock issuance costs		$ 252,000