Discontinued Operations - Discontinued Operations Related To Luna Lab Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Held-for-sale \| Luna Labs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 6,376	$ 5,700	$ 17,650	$ 16,929
Cost of revenues	5,145	4,383	13,892	12,225
Gross profit	1,231	1,317	3,758	4,704
Selling, general and administrative expenses	297	276	1,006	1,126
Operating income	934	1,041	2,752	3,578
Income tax expense	235	247	381	673
Net income from discontinued operations, net of tax	699	$ 794	$ 2,371	$ 2,905
Discontinued Operations, Held-for-sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	(500)
Net income from discontinued operations, net of tax	$ (1,400)

Disposal Group, Including Discontinued Operation, Income Tax Expense (Benefit)

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Amount of costs of goods sold attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of general and administrative expense attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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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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