The ONE Group Hospitality, Inc. Annual report pursuant to Section 13 and 15(d)

Stock-based compensation - Stock Option Grants (Details) (USD $)	1 Months Ended					12 Months Ended
	Nov. 30, 2014	Aug. 31, 2014	Jun. 30, 2014	Feb. 28, 2014	Oct. 31, 2013	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in USD per share)						5.07
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)	115,000	275,000	690,000	200,000		1,280,000
Granted (in USD per share)	$ 4.90	$ 5.00	$ 4.85	$ 6.00	$ 5.00