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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 |

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