CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) AND NONCONTROLLING INTEREST - USD ($) $ in Thousands		Total	Previously reported	Retroactive application of recapitalization	Total Stockholders' Equity (Deficit) Attributable to indie Semiconductor, Inc.	Total Stockholders' Equity (Deficit) Attributable to indie Semiconductor, Inc. Previously reported	Common Stock Common Stock Class A	Common Stock Common Stock Class V	Common Stock Previously reported Common Stock Class A	Common Stock Previously reported Common Stock Class V	Common Stock Retroactive application of recapitalization Common Stock Class A	Common Stock Retroactive application of recapitalization Common Stock Class V	Additional Paid-in Capital	Additional Paid-in Capital Previously reported	Additional Paid-in Capital Retroactive application of recapitalization	Accumulated Deficit	Accumulated Deficit Previously reported	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Previously reported	Noncontrolling Interest	Noncontrolling Interest Previously reported
Beginning balance (in shares) at Dec. 31, 2019		0	2,251,020	(2,251,020)
Beginning balance at Dec. 31, 2019		$ 0	$ 41,468	$ (41,468)
Beginning balance (in shares) at Dec. 31, 2019	[1]						33,405,625	33,373,294	0	0	33,405,625	33,373,294
Beginning balance at Dec. 31, 2019		(10,582)	$ (10,582)	$ 0	$ (13,962)	$ (13,962)	$ 3	$ 3	$ 0	$ 0	$ 3	$ 3	$ 42,039	$ 577	$ 41,462	$ (55,766)	$ (55,766)	$ (241)	$ (241)	$ 3,380	$ 3,380
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of equity awards (in shares)	[1]						213,673
Proceeds from sale of noncontrolling interest		1,452																		1,452
Net loss		(5,380)			(5,121)											(5,121)				(259)
Foreign currency translation adjustment		(78)			(68)													(68)		(10)
Ending balance (in shares) at Mar. 31, 2020	[1]						33,619,298	33,373,294
Ending balance at Mar. 31, 2020		$ (14,588)			(19,151)		$ 3	$ 3					42,039			(60,887)		(309)		4,563
Beginning balance (in shares) at Dec. 31, 2019		0	2,251,020	(2,251,020)
Beginning balance at Dec. 31, 2019		$ 0	$ 41,468	$ (41,468)
Beginning balance (in shares) at Dec. 31, 2019	[1]						33,405,625	33,373,294	0	0	33,405,625	33,373,294
Beginning balance at Dec. 31, 2019		(10,582)	$ (10,582)	$ 0	(13,962)	(13,962)	$ 3	$ 3	$ 0	$ 0	$ 3	$ 3	42,039	577	41,462	(55,766)	(55,766)	(241)	(241)	3,380	3,380
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(34,528)
Ending balance (in shares) at Sep. 30, 2020	[1]						34,090,095	33,373,294
Ending balance at Sep. 30, 2020		(42,889)			(47,131)		$ 3	$ 3					42,750			(89,704)		(183)		4,242
Beginning balance (in shares) at Mar. 31, 2020	[1]						33,619,298	33,373,294
Beginning balance at Mar. 31, 2020		(14,588)			(19,151)		$ 3	$ 3					42,039			(60,887)		(309)		4,563
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of equity awards (in shares)	[1]						130,522
Issuance of Class H Units		711			711								711
Issuance of Class H Units (in shares)	[1]						125,101
Net loss		(6,992)			(6,858)											(6,858)				(134)
Foreign currency translation adjustment		17			7													7		10
Ending balance (in shares) at Jun. 30, 2020	[1]						33,874,921	33,373,294
Ending balance at Jun. 30, 2020		(20,852)			(25,291)		$ 3	$ 3					42,750			(67,745)		(302)		4,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of equity awards (in shares)	[1]						215,174
Net loss		(22,156)			(21,959)											(21,959)				(197)
Foreign currency translation adjustment		119			119													119
Ending balance (in shares) at Sep. 30, 2020	[1]						34,090,095	33,373,294
Ending balance at Sep. 30, 2020		$ (42,889)			(47,131)		$ 3	$ 3					42,750			(89,704)		(183)		4,242
Beginning balance (in shares) at Dec. 31, 2020		0	2,287,279	(2,287,279)
Beginning balance at Dec. 31, 2020		$ 0	$ 42,179	$ (42,179)
Beginning balance (in shares) at Dec. 31, 2020	[1]						34,413,634	33,373,294	0	0	34,413,634	33,373,294
Beginning balance at Dec. 31, 2020		(101,492)	$ (101,492)	$ 0	(110,312)	(110,312)	$ 3	$ 3	$ 0	$ 0	$ 3	$ 3	43,155	982	42,173	(153,264)	(153,264)	(209)	(209)	8,820	8,820
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of equity awards (in shares)	[1]						631,121
Net loss		10,361			10,815											10,815				(454)
Foreign currency translation adjustment		(52)			(88)													(88)		36
Ending balance (in shares) at Mar. 31, 2021	[1]						35,044,755	33,373,294
Ending balance at Mar. 31, 2021		$ (91,183)			(99,585)		$ 3	$ 3					43,155			(142,449)		(297)		8,402
Beginning balance (in shares) at Dec. 31, 2020		0	2,287,279	(2,287,279)
Beginning balance at Dec. 31, 2020		$ 0	$ 42,179	$ (42,179)
Beginning balance (in shares) at Dec. 31, 2020	[1]						34,413,634	33,373,294	0	0	34,413,634	33,373,294
Beginning balance at Dec. 31, 2020		(101,492)	$ (101,492)	$ 0	(110,312)	$ (110,312)	$ 3	$ 3	$ 0	$ 0	$ 3	$ 3	43,155	$ 982	$ 42,173	(153,264)	$ (153,264)	(209)	$ (209)	8,820	$ 8,820
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(84,812)
Ending balance (in shares) at Sep. 30, 2021	[1]						96,428,533	33,827,371
Ending balance at Sep. 30, 2021		79,347			96,755		$ 9	$ 3					271,738			(175,056)		61		(17,408)
Beginning balance (in shares) at Mar. 31, 2021	[1]						35,044,755	33,373,294
Beginning balance at Mar. 31, 2021		(91,183)			(99,585)		$ 3	$ 3					43,155			(142,449)		(297)		8,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		$ (13,566)			(13,434)											(13,434)				(132)
Ending balance (in shares) at Jun. 10, 2021		2,930,711
Beginning balance (in shares) at Mar. 31, 2021	[1]						35,044,755	33,373,294
Beginning balance at Mar. 31, 2021		$ (91,183)			(99,585)		$ 3	$ 3					43,155			(142,449)		(297)		8,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of equity awards (in shares)	[1]						1,133,889
Reverse recapitalization on June 10, 2021 (in shares)	[1]						60,441,289	454,077
Reverse recapitalization on June 10, 2021		250,135			250,135		$ 6						250,129
Share-based compensation		7,968			7,968								7,968
Reverse recapitalization: ADK Minority Holders interest on June 10, 2021		0			4,101								(36,831)			40,892		40		(4,101)
Reverse recapitalization: ADK Minority Holders interest on June 10, 2021 (in shares)	[1]						(378,605)
Foreign currency translation adjustment		112			146													146		(34)
Ending balance (in shares) at Jun. 30, 2021	[1]						96,241,328	33,827,371
Ending balance at Jun. 30, 2021		$ 180,021			168,915		$ 9	$ 3					264,421			(95,407)		(111)		11,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class H Units							$ 4						377,654
Issuance of Class H Units (in shares)							44,797,894
Reverse recapitalization on June 10, 2021 (in shares)							60,441,289	454,077
Reverse recapitalization on June 10, 2021							$ 6	$ 0					250,129
Ending balance (in shares) at Jun. 10, 2021		2,930,711
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		$ 26,555			19,584											19,584				6,971
Ending balance (in shares) at Jun. 30, 2021	[1]						96,241,328	33,827,371
Ending balance at Jun. 30, 2021		180,021			168,915		$ 9	$ 3					264,421			(95,407)		(111)		11,106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of equity awards (in shares)	[1]						187,205
Reverse recapitalization on June 10, 2021		1,100			1,100								1,100
Net loss		(108,161)			(79,649)											(79,649)				(28,512)
Share-based compensation		6,217			6,217								6,217
Foreign currency translation adjustment		170			172													172		(2)
Ending balance (in shares) at Sep. 30, 2021	[1]						96,428,533	33,827,371
Ending balance at Sep. 30, 2021		$ 79,347			$ 96,755		$ 9	$ 3					$ 271,738			$ (175,056)		$ 61		$ (17,408)

[1] (1) Retroactively restated to give effect to the reverse recapitalization.