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Business Segmentation and Geographical Distribution
6 Months Ended
Jun. 30, 2016
Segment Reporting [Abstract]  
Business Segmentation and Geographical Distribution

(8) Business Segmentation and Geographical Distribution

Revenue from international sources approximated $351 and $475 for the three and six months ended June 30, 2016, respectively, compared to $189 and $564 for the same periods in 2015. 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.