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Segment Reporting | 3 Months Ended
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Mar. 31, 2019
Segment Reporting |
| 14. | Segment Reporting
The Company views its operations, makes decisions regarding how to allocate resources and manages its business as one operating segment. As a result, the financial information disclosed herein represents all of the material financial information related to the Company’s sole operating segment. The following table represents product revenues by product line:
|  | Three Months Ended March 31, |  |  | Increase/ (Decrease) |
|  | 2019 |  |  | 2018 |  |  | $ Change |  |  | % Change |
|  | (Amounts in thousands) |  |  |  |  |  |  |
Chromatography products |  | $ | 13,890 |  |  | $ | 10,583 |  |  | $ | 3,307 |  |  |  | 31.2 | %
Filtration products |  |  | 28,882 |  |  |  | 19,793 |  |  |  | 9,089 |  |  |  | 45.9 | %
Protein products |  |  | 16,653 |  |  |  | 13,586 |  |  |  | 3,067 |  |  |  | 22.6 | %
Other |  |  | 1,187 |  |  |  | 837 |  |  |  | 350 |  |  |  | 41.8 | %
Total product revenue |  | $ | 60,612 |  |  | $ | 44,799 |  |  | $ | 15,813 |  |  |  | 35.3 | %
Revenue from protein products includes our Protein A ligands and cell culture growth factors. Revenue from filtration products includes our XCell ATF Systems and consumables as well as our KrosFlo and SIUS filtration products. Revenue from chromatography products includes our OPUS and OPUS PD chromatography columns, chromatography resins and ELISA test kits. Other revenue primarily consists of revenue from the sale of operating room products to hospitals as well as freight revenue. The following table represents the Company’s total revenue by geographic area (based on the location of the customer):
|  | Three Months Ended |
|  | March 31, |
|  | 2019 |  |  | 2018 |
Revenue by customers’ geographic locations: |  |  |  |  |  |  |  |
North America |  |  | 47 | % |  |  | 45 | %
Europe |  |  | 40 | % |  |  | 43 | %
APAC |  |  | 13 | % |  |  | 11 | %
Other |  |  | 0 | % |  |  | 1 | %
Total revenue |  |  | 100 | % |  |  | 100 | %
Concentrations of Credit Risk and Significant Customers Financial instruments that subject the Company to significant concentrations of credit risk primarily consist of cash and cash equivalents, marketable securities and accounts receivable. Per the Company’s investment policy, cash equivalents and marketable securities are invested in financial instruments with high credit ratings and credit exposure to any one issue, issuer (with the exception of U.S. treasury obligations) and type of instrument is limited. At March 31, 2019 and December 31, 2018, the Company had no investments associated with foreign exchange contracts, options contracts or other foreign hedging arrangements. Concentration of credit risk with respect to accounts receivable is limited to customers to whom the Company makes significant sales. While a reserve for the potential write-off of accounts receivable is maintained, the Company has not written off any significant accounts to date. To control credit risk, the Company performs regular credit evaluations of its customers’ financial condition. Revenue from significant customers as a percentage of the Company’s total revenue is as follows:
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
MilliporeSigma |  |  | 16 | % |  |  | 17 | %
GE Healthcare |  |  | 13 | % |  |  | 14 | %
Significant accounts receivable balances as a percentage of the Company’s total trade accounts receivable are as follows:
|  | March 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |
GE Healthcare |  |  | 15 | % |  |  | 17 | %
MilliporeSigma |  |  | * |  |  |  | 11 | %
| * | MilliporeSigma’s percentage of the Company’s total trade accounts receivable at March 31, 2019 did not exceed 10 %.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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