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Business Segmentation and Geographical Distribution
9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Business Segmentation and Geographical Distribution

(9) Business Segmentation and Geographical Distribution

Revenue from international sources approximated $276 and $956 for the three and nine months ended September 30, 2017, respectively, compared to $143 and $618 for the same periods in 2016. All of this revenue was product revenue.

Our operations comprise a single business segment and all of our long-lived assets are located within the United States.