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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |
Net sales | $ 41,285,000 | $ 28,556,000 | $ 77,192,000 | $ 51,648,000
Cost of sales | 5,522,000 | 4,359,000 | 10,702,000 | 7,480,000
Gross profit | 35,763,000 | 24,197,000 | 66,490,000 | 44,168,000
Operating expenses: |  |  |  |
Selling, general and administrative | 24,675,000 | 15,120,000 | 46,156,000 | 27,408,000
In-process research and development | 5,320,000 |  | 5,320,000 |
Research and development | 9,633,000 | 6,955,000 | 18,575,000 | 14,017,000
Total operating expenses | 39,628,000 | 22,075,000 | 70,051,000 | 41,425,000
(Loss) income from operations | (3,865,000) | 2,122,000 | (3,561,000) | 2,743,000
Other income, net |  |  |  |
Interest and other income | 598,000 | 286,000 | 1,234,000 | 621,000
Interest and other expense, net | (12,000) | (76,000) | (19,000) | (178,000)
Change in fair value of stock warrant liability |  |  |  | 43,000
Total other income, net | 586,000 | 210,000 | 1,215,000 | 486,000
(Loss) income before taxes | (3,279,000) | 2,332,000 | (2,346,000) | 3,229,000
Provision for income taxes | 22,000 | 0 | 77,000 | 0
Net (loss) income attributable to Glaukos Corporation stockholders | $ (3,301,000) | $ 2,332,000 | $ (2,423,000) | $ 3,229,000
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
Weighted average shares used to compute basic net (loss) income per share attributable to Glaukos Corporation stockholders | 34,322 | 32,652 | 34,234 | 32,477
Weighted average shares used to compute diluted net (loss) income per share attributable to Glaukos Corporation stockholders | 34,322 | 36,182 | 34,234 | 35,975

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