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Discontinued Operations and Divestitures - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 15, 2015 | Jan. 31, 2016 | Apr. 30, 2015 | Jul. 31, 2014 | Sep. 30, 2013 | Sep. 27, 2013 | May. 31, 2013 | Oct. 31, 2012 | Dec. 31, 2014 | Sep. 26, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | 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 |  |  |  |
Gain (Loss) on sale of business, net of tax |  |  |  |  |  |  |  |  | $ (1,405,000) | $ (321,000) |  | $ (1,726,000) | $ (592,000) |  |
Assets of discontinued operations |  |  |  |  |  |  |  |  | 631,000 |  | 0 | 631,000 |  |  |
Liabilities of discontinued operations |  |  |  |  |  |  |  |  | $ 324,000 |  | 0 | 324,000 |  |  |
Semiconductor Systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business, net of transaction costs |  |  |  |  |  |  | $ 9,700,000 |  |  |  |  |  |  |  |
Gain (Loss) on sale of business, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | $ (400,000) |  |
Settlement of closing working capital adjustments |  |  |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |  |
Laser Systems |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business, net of transaction costs |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |  |
Gain (Loss) on sale of business, net of tax |  |  |  |  |  | $ (200,000) |  |  |  |  |  |  |  | $ 2,300,000 |
Settlement of closing working capital adjustments |  |  |  |  | $ (400,000) |  |  |  |  |  |  |  |  |  |
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 |  | $ 29,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on sale of business |  |  | $ 19,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on sale of business, net of tax | $ 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%
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on sale of business, net of tax |  |  |  |  |  |  |  |  |  |  |  | (1,700,000) |  |  |
Sale proceeds held in escrow |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |
Sale proceeds held in escrow, Period |  |  |  |  |  |  |  |  |  |  | 2016-01 |  |  |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |
Scientific Lasers Business | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale proceeds held in escrow |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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