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Summary of Significant Accounting Policies - Summary (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Foreign Currency Translation          
Loss from foreign currency translation adjustments $ 300,000 $ 100,000 $ 700,000 $ 400,000  
Foreign currency transaction gains realized 95,000 (38,000) 112,000 23,000  
Foreign currency transaction gains 400,000 42,000 700,000 300,000  
Trading Securities          
Trading securities 0   $ 0   $ 0
Revenue Recognition          
Warranty period from date of shipment     1 year    
Numerator:          
Net income (loss) attributable to Glaukos Corporation - basic $ (3,301,000) $ 2,332,000 $ (2,423,000) $ 3,229,000  
Denominator:          
Weighted average number of common shares outstanding - basic 34,322 32,652 34,234 32,477  
Common stock equivalents from outstanding common stock options   3,510   3,485  
Common stock equivalents for ESPP   20   12  
Common stock equivalents from outstanding common stock warrants       1  
Weighted average number of common shares outstanding - diluted 34,322 36,182 34,234 35,975  
Basic net (loss) income per share, attributable to Glaukos Corporation stockholders $ (0.10) $ 0.07 $ (0.07) $ 0.10  
Diluted net (loss) income per share, attributable to Glaukos Corporation stockholders $ (0.10) $ 0.06 $ (0.07) $ 0.09