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Fair value measurements (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Fair value measurements    
Warrant liability - related party $ 813 $ 976
Fair value Assumptions    
Company's ending stock price (in dollars per share) $ 0.56 $ 0.58
Company's stock volatility (as a percent) 110.00% 110.00%
Risk free interest rate (as a percent) 1.39% 1.39%
Recurring    
Fair value measurements    
Cash and cash equivalents $ 2,726 $ 2,588
Trade accounts receivable 469 380
Trade accounts receivable - related party 4 643
Short-term investments 231 334
Assets 3,430 3,945
Warrant liability - related party 813 976
Warrant liability 721 922
Liabilities 1,534 1,898
Recurring | Level 1    
Fair value measurements    
Cash and cash equivalents 2,726 2,588
Trade accounts receivable 469 380
Trade accounts receivable - related party 4 643
Short-term investments 231 334
Assets 3,430 3,945
Recurring | Level 3    
Fair value measurements    
Warrant liability - related party 813 976
Warrant liability 721 922
Liabilities $ 1,534 $ 1,898