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Noncontrolling Interest Transactions - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 30, 2016	Dec. 28, 2015	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Contingent consideration				$ 678,000	$ 408,000
Converpower Corporation [Member]
Noncontrolling Interest [Line Items]
Ownership percentage by parent in certain operating assets and cash	100.00%
Minority interest percentage by non controlling interest	49.00%
Percentage of common shares exchanged	49.00%
Contingent consideration			$ 208,000		282,000
Increased in liability reassessment obligation			$ 448,000
Mission Power Solutions Inc [Member]
Noncontrolling Interest [Line Items]
Minority interest percentage by non controlling interest		18.00%
Contingent consideration					$ 126,000	$ 144,000
Noncontrolling interest		$ 216,000
Mission Power Solutions Inc [Member]
Noncontrolling Interest [Line Items]
Increased in liability reassessment obligation				$ 202,000

X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

+ References

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+ References

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