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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Revenue | $ 12,366 | $ 11,573 | $ 35,362 | $ 33,382
Cost of goods sold | 4,921 | 4,856 | 14,054 | 13,464
Gross profit | 7,445 | 6,717 | 21,308 | 19,918
Operating expenses: |  |  |  |
Sales and marketing | 2,220 | 1,821 | 6,575 | 6,209
Research and product development | 1,788 | 1,959 | 5,497 | 5,996
General and administrative | 1,405 | 1,470 | 4,639 | 4,561
Proceeds from litigation, net | (272) | 0 | (272) | (250)
Total operating expenses | 5,141 | 5,250 | 16,439 | 16,516
Operating income | 2,304 | 1,467 | 4,869 | 3,402
Other income (expense), net | 85 | 29 | 117 | 40
Income before income taxes | 2,389 | 1,496 | 4,986 | 3,442
Provision for income taxes | 726 | 492 | 1,548 | 1,310
Net income | 1,663 | 1,004 | 3,438 | 2,132
Basic earnings per common share | $ 0.18 | $ 0.11 | $ 0.38 | $ 0.23
Diluted earnings per common share | $ 0.18 | $ 0.11 | $ 0.36 | $ 0.23
Basic weighted average shares outstanding | 9,027,764 | 9,113,713 | 9,090,903 | 9,106,455
Diluted weighted average shares outstanding | 9,406,941 | 9,193,574 | 9,485,808 | 9,219,161
Unrealized gain (loss) on available-for-sale securities | 55 | 0 | (33) | 0
Comprehensive income | $ 1,718 | $ 1,004 | $ 3,405 | $ 2,132

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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