Discontinued Operations and Divestitures - Additional Information (Details) - USD ($)	1 Months Ended			12 Months Ended
	Jan. 31, 2016	Apr. 30, 2015	Jul. 31, 2014	Dec. 31, 2017	Dec. 31, 2015	Jun. 30, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of transaction costs					$ 29,570,000
JK Lasers Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of transaction costs		$ 29,600,000
Pre-tax gain (loss) on sale of business					19,600,000
Excel Laser Technology Private Limited
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Minority interest ownership percentage						50.00%
Ownership in joint venture, Excel Laser Technology Private Limited | Maximum
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Pre-tax gain (loss) on sale of business					$ (100,000)
Scientific Lasers Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of transaction costs			$ 6,500,000
Sale proceeds held in escrow			$ 1,500,000
Sale proceeds held in escrow, period				2016-01
Escrow deposit released	$ 1,500,000