Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue		$ 40,541	$ 30,534
Cost of revenue	[1],[2],[3]	28,544	17,123
Gross profit		11,997	13,411
Operating expenses
Selling, general, and administrative	[4]	14,763	7,670
Depreciation and amortization		4,517	2,672
Total operating expenses		19,280	10,342
Operating (loss) income		(7,283)	3,069
Interest expense and other (income) expense
Interest expense		1,473	2,114
Other expense		116	1,540
Other income		(27,165)	(94)
Total interest expense and other (income) expense, net		(25,576)	3,560
Net income (loss) before income tax		18,293	(491)
Income tax expense		454	9
Net income (loss)		17,839	(500)
Net loss attributable to Fathom OpCo non-controlling interest (Note 14)		(5,259)
Net income attributable to controlling interest		23,098	(500)
Comprehensive income (loss):
Loss from foreign currency translation adjustments		(107)	(107)
Comprehensive income (loss), net of tax		$ 22,991	$ (607)
Net income (loss) per unit attributable to Class A and Class B common unit holders
Basic and Diluted	[5]		$ (0.36)
Weighted average Class A and Class B units outstanding
Basic and Diluted			7,723,592
Net income per share attributable to shares of Class A common stock
Basic		$ 0.45
Diluted		$ 0.13
Weighted average Class A common shares outstanding
Basic		50,785,656
Diluted		135,839,973

[1] Inclusive of $1,695 and $854 of depreciation and amortization for the three months ended March 31, 2022 and March 31, 2021, respectively;

[2] Inclusive of $3,241 and $277 of inventory step-up amortization for the three months ended March 31, 2022 and March 31, 2021, respectively;

[3] Inclusive of $1,108 and $580 of cost of revenue related to inventory purchases from a related party for the three months ended March 31, 2022 and March 31, 2021, respectively;

[4] Inclusive of $71 and $353 of management fees incurred to a related party for the three months ended March 31, 2022 and March 31, 2021, respectively;

[5] Basic and diluted net loss per unit amounts are the same for both Class A common units and Class B common units. See Note 13.