Goodwill - Goodwill from the acquisition (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill
Goodwill at December 31, 2019			$ 0
Impairment of goodwill	$ (11,706)	$ 0	(11,706)	$ 0
Goodwill at September 30, 2020	8,092		8,092
JP3 Measurement, LLC
Goodwill
Goodwill at December 31, 2019			0
Goodwill from acquisition of JP3			17,522
Measurement period adjustment	2,300		2,276
Goodwill at September 30, 2020	$ 8,092		$ 8,092

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 increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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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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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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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