Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Cash payments to lessor's for use of assets under operating leases.

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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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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Number of shares that have been repurchased and retired during the period.

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Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Common stock, shares issued		34,953,825	34,707,924
Rent expense		$ 3,700,000	$ 4,200,000	$ 4,500,000
Adwest Technologies, Inc. ('Adwest') [Member]
Related Party Transaction [Line Items]
Rent expense paid to former owner		0
Common Stock [Member]
Related Party Transaction [Line Items]
Common stock, shares issued	89,640			89,640
Share purchased				105,000
Common Stock [Member] \| Current Segment President [Member]
Related Party Transaction [Line Items]
Share purchased	75,000			75,000
Adwest, Zhongli, and Emtrol Subsidiaries [Member]
Related Party Transaction [Line Items]
Rent expense		600,000	600,000	$ 1,100,000
Zhongli Subsidiary [Member]
Related Party Transaction [Line Items]
Purchase of inventory		300,000	800,000	800,000
Sale of inventory		100,000	100,000	0
Consulting Services [Member] \| Related Party One [Member]
Related Party Transaction [Line Items]
Rent and other expenses paid		200,000	300,000	400,000
Consulting Services [Member] \| Related Party Two [Member]
Related Party Transaction [Line Items]
Rent and other expenses paid		$ 100,000	$ 100,000	$ 100,000