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Selected Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | [2] | Sep. 30, 2016 | [2] | Jun. 30, 2016 | [2] | Mar. 31, 2016 | [2] | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REVENUE | $ 52,826 | $ 43,999 | $ 47,818 | $ 45,059 | $ 45,029 | $ 45,252 | $ 47,083 | $ 43,016 | $ 39,838 | $ 36,703 | $ 35,526 | $ 33,831 | $ 189,702 |  | $ 180,380 |  | $ 145,898 |
GROSS MARGIN | 36,363 | 29,862 | 32,905 | 29,512 | 31,195 | 29,782 | 30,301 | 27,621 | 26,516 | 22,982 | 21,554 | 19,667 | 128,642 |  | 118,899 |  | 90,719 |
NET INCOME (LOSS) | $ (3,007) | $ 1,325 | $ 3,163 | $ 2,223 | $ 2,897 | $ 2,993 | $ 2,347 | $ 2,541 | $ 2,636 | $ 2,145 | $ (502) | $ (274) | $ 3,704 |  | $ 10,778 |  | $ 4,005 |
INCOME (LOSS) PER COMMON SHARE - DILUTED | $ (0.09) | $ 0.04 | $ 0.09 | $ 0.06 | $ 0.09 | $ 0.09 | $ 0.07 | $ 0.08 | $ 0.09 | $ 0.07 | $ (0.02) | $ (0.01) | $ 0.11 | [3] | $ 0.32 | [3] | $ 0.14 | [3]
Gain on sale of Medafor investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 891 |
[1] | In December 2017 we completed our acquisition of JOTEC, which is also being operated as a wholly owned subsidiary of CryoLife.
[2] | In January 2016 we completed our acquisition of On-X Life Technologies Holdings, Inc., which is being operated as a wholly owned subsidiary of CryoLife. In 2016 we also sold our HeRO Graft product line and our ProCol product line, and ceased sales of these products during 2016.
[3] | We excluded stock options from the calculation of diluted weighted-average common shares outstanding if the per share value, including the sum of (i) the exercise price of the options and (ii) the amount of the compensation cost attributed to future services and not yet recognized, was greater than the average market price of the shares, because the inclusion of these stock options would be antidilutive to income per common share. Accordingly, stock options to purchase 227,000, 1,000, and 710,000 shares for the years ended December 31, 2017, 2016, and 2015, respectively, were excluded from the calculation of diluted weighted-average common shares outstanding.

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- Definition This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting and any losses recognized thereon for impairments of other than a temporary nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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