| Schedule of earnings per share, basic and diluted | 
 
		
			For the three and nine months ended September 30, 2019 and 2018, the earnings per share was calculated as follows (in thousands, except earnings per share and related share data):
		 
		
			 
		 
		
			
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				 | 
				
					 
						  
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						Three months ended September 30,  
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						Nine months ended September 30,  
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				 | 
				
					 
						     
				 | 
				
					 
						2019 
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				 | 
				
					 
						2018 
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				 | 
				
					 
						2019 
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				 | 
				
					 
						2018 
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				| 
					 
						Net income (loss) attributable to The ONE Group Hospitality, Inc. 
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						$ 
				 | 
				
					 
						 460 
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				 | 
				
					 
						$ 
				 | 
				
					 
						 (305) 
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				 | 
				
					 
						$ 
				 | 
				
					 
						 992 
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				 | 
				
					 
						$ 
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						 106 
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				 | 
				
					 
						  
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						Basic weighted average shares outstanding 
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						 28,537,477 
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						 27,751,632 
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						 28,429,074 
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						 27,437,269 
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						Dilutive effect of stock options, warrants and restricted share units 
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				 | 
				
					 
						  
				 | 
				
					 
						 1,363,667 
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				 | 
				
					 
						  — 
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				 | 
				
					 
						  
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						 1,213,852 
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				 | 
				
					 
						  
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						 62,376 
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						Diluted weighted average shares outstanding 
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						 29,901,144 
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				 | 
				
					 
						  
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						 27,751,632 
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						 29,642,926 
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						 27,499,645 
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				 | 
				
					 
						  
				 | 
				
					 
						  
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						Net income (loss) available to common stockholders per share - Basic 
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						$ 
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						 0.02 
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						 (0.01) 
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						$ 
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						 0.03 
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						$ 
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						 0.00 
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				| 
					 
						Net income (loss) available to common stockholders per share - Diluted 
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						$ 
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						 0.02 
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						$ 
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						 (0.01) 
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						$ 
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						 0.03 
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				 | 
				
					 
						$ 
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						 0.00 
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