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Concentration of Credit Risk (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Concentration Risk [Line Items]      
Trade accounts receivable $ 169   $ 77
Cash and cash equivalents | Concentration of Credit Risk      
Concentration Risk [Line Items]      
Risk concentration (percent) 70.00%   100.00%
Accounts receivable | Customer Concentration Risk | Denver Health      
Concentration Risk [Line Items]      
Risk concentration (percent) 76.00%   66.00%
Trade accounts receivable $ 129   $ 50
Revenue from product sales | Customer Concentration Risk | Denver Health      
Concentration Risk [Line Items]      
Risk concentration (percent) 100.00% 0.00%