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Organization and Basis of Presentation - Additional Information (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) Segment $ / shares shares	Aug. 28, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Consolidation And Basis Of Presentation [Line Items]
Number of reportable business segments \| Segment	1
Stockholders equity	$ 4,036		$ 21,255	$ 62,096	$ 434,207	$ 480,045	$ 405,087	$ 385,497	$ 416,558
Common stock, par value \| $ / shares	$ 0.01				$ 0.01
Legacy Amplify [Member]
Consolidation And Basis Of Presentation [Line Items]
Number of common stock share for each shar \| shares	0.933
Maximum [Member]
Consolidation And Basis Of Presentation [Line Items]
Global market capitalization		$ 50,000,000
Stockholders equity		$ 50,000,000

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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