Organization and Significant Accounting Policies. (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of concentrations of credit risk major customers

	Years Ended December 31,
	2020			2019
Customer A		9	%		11	%
Customer B		5	%		13	%

Schedule of purchases from external customers

	Years Ended December 31,
	2020			2019
Supplier A		9	%		25	%
Supplier B		16	%		16	%

Schedule of inventory

	December 31,
	2020		2019
Finished goods	$	25,154	$	38,194
Work in progress		4,333		7,426
Raw materials		7,074		7,890
Carbon and RIN credits		3,842		5,690
Other		1,364		1,400
Total	$	41,767	$	60,600

Schedule of property and equipment useful lives

Buildings	40 years
Facilities and plant equipment	10 – 25 years
Other equipment, vehicles and furniture	5 – 10 years

Schedule of earnings per share

	Year Ended December 31, 2020
	Loss Numerator			Shares Denominator		Per-Share Amount
Net loss attributed to Alto Ingredients, Inc.	$	(15,116	)
Less: Preferred stock dividends		(1,268	)
Basic and Diluted loss per share:
Loss available to common stockholders	$	(16,384	)		58,609	$	(0.28	)

	Year Ended December 31, 2019
	Loss Numerator			Shares Denominator		Per-Share Amount
Net loss attributed to Alto Ingredients, Inc.	$	(88,949	)
Less: Preferred stock dividends		(1,265	)
Basic and Diluted loss per share:
Loss available to common stockholders	$	(90,214	)		47,384	$	(1.90	)