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(10) Concentrations of Credit Risk, Significant Customers and Geographic Information (Tables)
12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Significant customer percent of revenues
    Percent of Total Revenues
Significant Customer    2016    2015    2014
A   19%   27%   38%
B   20%   23%   21%
C   10%   10%   10%
Revenues by location
    Percent of Total Revenues
Country    2016    2015    2014
United States of America   29%   21%   20%
Germany   38%   50%   59%
Other   33%   29%   21%