Fair Value Measurements - Summary of Changes in the Fair Value of Level 3 Contingent Consideration (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2017	Mar. 31, 2017	Sep. 29, 2017
Applimotion Inc.
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration			$ (1,200)
Lincoln Laser Company
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration			(1,400)
Skyetek Inc.
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration		$ (100)
Fair Value, Inputs, Level 3
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance			$ 5,156	$ 5,156
Fair value adjustments	[1]			425
Ending balance		$ 2,800		2,800
Fair Value, Inputs, Level 3 | Applimotion Inc.
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration				(1,200)
Fair Value, Inputs, Level 3 | Lincoln Laser Company
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration				(1,433)
Fair Value, Inputs, Level 3 | Skyetek Inc.
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration				$ (148)

[1] In the nine months ended September 29, 2017, the fair value of the contingent consideration in connection with the acquisition of Applimotion was increased by $0.4 million due to increased actual and projected revenue performance.