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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue |  |  |  |
Sales revenue | $ 91,987 | $ 58,038 | $ 165,571 | $ 104,004
Rental revenue | 5,251 | 6,083 | 10,718 | 12,617
Total revenue | 97,238 | 64,121 | 176,289 | 116,621
Cost of revenue |  |  |  |
Cost of sales revenue | 44,968 | 27,993 | 81,916 | 49,906
Cost of rental revenue, including depreciation of $1,966 and $2,522 for the three months ended and $4,131 and $5,211 for the six months ended,respectively | 3,800 | 4,561 | 8,176 | 9,404
Total cost of revenue | 48,768 | 32,554 | 90,092 | 59,310
Gross profit |  |  |  |
Gross profit-sales revenue | 47,019 | 30,045 | 83,655 | 54,098
Gross profit-rental revenue | 1,451 | 1,522 | 2,542 | 3,213
Total gross profit | 48,470 | 31,567 | 86,197 | 57,311
Operating expense |  |  |  |
Research and development | 1,775 | 1,260 | 3,191 | 2,569
Sales and marketing | 22,999 | 11,945 | 41,037 | 22,474
General and administrative | 9,675 | 9,865 | 19,248 | 18,200
Total operating expense | 34,449 | 23,070 | 63,476 | 43,243
Income from operations | 14,021 | 8,497 | 22,721 | 14,068
Other income (expense) |  |  |  |
Interest income | 673 | 146 | 1,216 | 247
Other income (expense) | (1,048) | 523 | (604) | 730
Total other income (expense), net | (375) | 669 | 612 | 977
Income before provision (benefit) for income taxes | 13,646 | 9,166 | 23,333 | 15,045
Provision (benefit) for income taxes | (964) | 828 | (2,035) | 775
Net income | 14,610 | 8,338 | 25,368 | 14,270
Other comprehensive income (loss), net of tax |  |  |  |
Change in foreign currency translation adjustment | 76 | 197 | 184 | 197
Change in net unrealized gains (losses) on foreign currency hedging | 723 | (300) | 474 | (246)
Less: reclassification adjustment for net (gains) losses included in net income | (103) | 49 | 69 | (8)
Total net change in unrealized gains (losses) on foreign currency hedging | 620 | (251) | 543 | (254)
Change in net unrealized gains (losses) on available-for-sale investments | 19 | (6) |  | 58
Total other comprehensive income (loss), net of tax | 715 | (60) | 727 | 1
Comprehensive income | $ 15,325 | $ 8,278 | $ 26,095 | $ 14,271
Basic net income per share attributable to common stockholders (Note 5) | $ 0.69 | $ 0.40 | $ 1.20 | $ 0.69
Diluted net income per share attributable to common stockholders (Note 5) | $ 0.65 | $ 0.38 | $ 1.13 | $ 0.66
Weighted-average number of shares used in calculating net income per share attributable to common stockholders: |  |  |  |
Basic common shares | 21,172,170 | 20,622,320 | 21,099,566 | 20,556,293
Diluted common shares | 22,503,749 | 21,848,359 | 22,409,011 | 21,731,592

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