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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Goodwill and Intangible Assets, Net - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) reporting_unit	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Goodwill [Line Items]
Accumulated goodwill impairment losses		$ 43,643	$ 43,643
Impairment of goodwill	$ 178	9,635	87,862	$ 0
Number of reporting units closed \| reporting_unit	2
Loss on abandonment of assets		4,442	3,071	20,928
Amortization expense		$ 7,593	7,920	11,666
Trans Ova
Goodwill [Line Items]
Impairment of goodwill			$ 29,642
Patents, developed technologies and know-how
Goodwill [Line Items]
Loss on abandonment of assets				$ 16,027