Discontinued Operations - Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income from discontinuing operations	$ 0	$ 266	$ 0	$ 266
MDSS post-warranty service business \| Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	0	0	0	0
Total cost of revenues	0	0	0	0
Gross profit	0	0	0	0
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Marketing and sales	0	0	0	0
General and administrative	0	0	0	0
Amortization of intangible assets	0	0	0	0
Gain on sale of discontinued operations	0	(350)	0	(350)
Total operating expenses	0	(350)	0	(350)
Income from discontinued operations	0	350	0	350
Interest expense	0	0	0	0
Income from discontinuing operations before income taxes	0	350	0	350
Income tax expense	0	84	0	84
Income from discontinuing operations	$ 0	$ 266	$ 0	$ 266

Disposal Group, Including Discontinued Operation, Amortization, Discontinued Operations

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Disposal Group, Including Discontinued Operation, Selling And Marketing Expense

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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

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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 gross profit attributable to disposal group, including, but not limited to, discontinued operation.

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

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Amount of operating 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 attributable to the parent. 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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