Discontinued Operations and Divestitures - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 03, 2015	Apr. 15, 2015	Jul. 31, 2014	Jul. 03, 2015	Jul. 03, 2015	Jun. 30, 2015	Dec. 31, 2014
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of transaction costs					$ 30,623,000
Assets of discontinued operations	$ 0			$ 0	0		$ 631,000
Liabilities of discontinued operations	0			0	$ 0		$ 324,000
Ownership in joint venture, 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)
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		$ 30,623,000
Estimated cash payment	$ 1,000,000
Pre-tax gain (loss) on sale of business				$ 19,600,000
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