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2. Revenue (Details 2) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Contract Assets    
Revenue recognized that was included in the contract liability balance at the beginning of the period $ 0 $ 0
Increase due to cash received, excluding amounts recognized as revenue during the period 0 0
Transferred to receivables from contract assets recognized at the beginning of the period (7) (13)
Increase due to additional unamortized discounts 31 23
Contract Liabilities    
Revenue recognized that was included in the contract liability balance at the beginning of the period (852) (882)
Increase due to cash received, excluding amounts recognized as revenue during the period 831 1,033
Transferred to receivables from contract assets recognized at the beginning of the period 0 0
Increase due to additional unamortized discounts $ 0 $ 0