Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Summary of Significant Accounting Policies and Other Information - Narrative (Details)		3 Months Ended
	Apr. 02, 2020 USD ($)	Mar. 31, 2020 USD ($) board_member segment	Mar. 31, 2019 USD ($)
Concentration Risk [Line Items]
Number of board members \| board_member		3
Number of operating segments \| segment		1
Research and development and engineering expenses		$ 6,400,000	$ 5,800,000
Subsequent Event \| Revolving Credit Facility \| Standard Chartered Bank Credit Agreement
Concentration Risk [Line Items]
Borrowing amount	$ 130,000,000
Maturity period prior to the final maturity of unsecured senior notes	60 days
Extension fee percentage	0.25%