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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue: |  |  |  |
Revenue | $ 49,529 | $ 36,580 | $ 142,090 | $ 99,624
Operating expenses: |  |  |  |
Cost of product revenue | 22,183 | 19,987 | 62,939 | 47,913
Research and development | 3,601 | 2,001 | 12,669 | 5,603
Selling, general and administrative | 15,859 | 14,998 | 48,347 | 35,365
Total operating expenses | 41,643 | 36,986 | 123,955 | 88,881
Income (loss) from operations | 7,886 | (406) | 18,135 | 10,743
Other income (expenses): |  |  |  |
Investment income | 558 | 102 | 1,251 | 308
Interest expense | (1,687) | (1,618) | (5,008) | (4,804)
Other (expenses) income | (134) | (100) | 187 | (548)
Total other expenses, net | (1,263) | (1,616) | (3,570) | (5,044)
Income (loss) before income taxes | 6,623 | (2,022) | 14,565 | 5,699
Income tax provision (benefit) | 1,829 | (6,691) | 3,586 | (10,476)
Net income | $ 4,794 | $ 4,669 | $ 10,979 | $ 16,175
Earnings per share: |  |  |  |
Basic | $ 0.11 | $ 0.11 | $ 0.25 | $ 0.44
Diluted | $ 0.10 | $ 0.11 | $ 0.24 | $ 0.43
Weighted average shares outstanding: |  |  |  |
Basic | 43,822,472 | 41,236,554 | 43,728,503 | 36,435,591
Diluted | 45,828,175 | 42,563,002 | 45,132,115 | 37,386,333
Other comprehensive income: |  |  |  |
Unrealized gain on investments |  |  |  | $ 5
Foreign currency translation (loss) gain | $ (630) | $ 2,025 | $ (5,410) | 7,097
Comprehensive income | 4,164 | 6,694 | 5,569 | 23,277
Product Revenue |  |  |  |
Revenue: |  |  |  |
Revenue | 49,500 | 36,514 | 142,042 | 99,516
Royalty and Other Revenue |  |  |  |
Revenue: |  |  |  |
Revenue | $ 29 | $ 66 | $ 48 | $ 108

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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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