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Revenue From Contracts With Customers (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following tables represent a disaggregation of revenue from contracts with customers for the year ended December 31, 2018.
Sales by application 
Materials processing $1,374,448 
Other applications 85,426 
Total $1,459,874 

Sales by product 
High Power Continuous Wave ("CW") Lasers $909,726 
Medium and Low Power CW Lasers 95,764 
Pulsed Lasers
162,048 
Quasi-Continuous Wave ("QCW") Lasers
66,700 
Laser Systems 59,330 
Other Revenue including Amplifiers, Service, Parts, Accessories and Change in Deferred Revenue 166,306 
Total $1,459,874 

Sales by geography 
North America $202,743 
Europe: 
Germany 111,259 
Other including Eastern Europe/CIS 296,917 
Asia and Australia: 
China 629,079 
Japan 87,619 
Other 127,251 
Rest of World 5,006 
Total $1,459,874 

Timing of revenue recognition 
Goods and services transferred at a point in time $1,447,343 
Services transferred over time 12,531 
Total $1,459,874 
Changes in Contract Assets and Liabilities
The following table reflects the changes in the Company's contract assets and liabilities for the year ended December 31, 2018:
December 31, January 1, 
20182018Change 
Contract assets 
Contract assets 10,102 — 10,102 100.0 %
Contract liabilities 
Contract liabilities - current 52,606 46,508 6,098 13.1 %
Contract liabilities - long-term 1,413 182 1,231 676.4 %
Schedule of Remaining Performance Obligations The following table represents the Company's remaining performance obligations from contracts that are recognized over time as of December 31, 2018:
Remaining Performance Obligations 
201920202021202220232024Total
Revenue expected to be recognized for extended warranty agreements 3,302 760 375 203 71 4 4,715 
Revenue to be earned over time from contracts to sell robotic systems 38,038 1,700 — — — — 39,738 
Total $41,340 $2,460 $375 $203 $71 $4 $44,453