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Revenue, Contract Balances (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Revenue [Abstract]    
Revenue recognized $ 309  
Contract liabilities [Abstract]    
Customer pre-payments 63 $ 50
Deferred revenue, current 357 384
Deferred revenue, non-current 206 265
Total contract liabilities $ 626 $ 699