Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Changes in the carrying amount of goodwill
Goodwill, balance beginning	$ 22,915	$ 24,089
Impact of foreign currency translation adjustments	670	(1,174)
Goodwill, balance ending	23,585	22,915
Provision for impairment of goodwill	0	0
E&P Technology & Services
Changes in the carrying amount of goodwill
Goodwill, balance beginning	2,943	2,943
Impact of foreign currency translation adjustments	0	0
Goodwill, balance ending	2,943	2,943
Optimization Software & Services
Changes in the carrying amount of goodwill
Goodwill, balance beginning	19,972	21,146
Impact of foreign currency translation adjustments	670	(1,174)
Goodwill, balance ending	$ 20,642	$ 19,972

Amount after accumulated impairment loss of 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 foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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