Earnings per Share - Schedule of Reconciliations of Numerators and Denominators Used to Compute Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net income (loss)	$ 4,597	$ (16,224)	$ (13,650)	$ (153,230)
Less: net income (loss) attributable to non-controlling interests	267	(1,215)	(432)	(9,912)
Net income (loss) attributable to Funko, Inc.	4,330	(15,009)	(13,218)	(143,318)
Add: Reallocation of net income attributable to non-controlling interests from the assumed exchange of common units of FAH, LLC for Class A common stock	0	0	0	0
Net income (loss) attributable to Funko, Inc. — diluted	$ 4,330	$ (15,009)	$ (13,218)	$ (143,318)
Denominator:
Weighted-average shares of Class A common stock outstanding — basic (in shares)	52,522,912	48,236,867	51,781,072	47,640,974
Add: Dilutive common units of FAH, LLC that are convertible into Class A common stock (in shares)	0	0	0	0
Add: Dilutive Funko, Inc. equity compensation awards (in shares)	905,024	0	0	0
Weighted-average shares of Class A common stock outstanding — diluted (in shares)	53,427,936	48,236,867	51,781,072	47,640,974
Earnings (loss) per share of Class A common stock — basic (in USD per share)	$ 0.08	$ (0.31)	$ (0.26)	$ (3.01)
Earnings (loss) per share of Class A common stock — diluted (in USD per share)	$ 0.08	$ (0.31)	$ (0.26)	$ (3.01)