Quarterly report pursuant to Section 13 or 15(d)

REVENUE RECOGNITION - Schedule of Changes in Contract Asset and Liability Balances (Details)

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REVENUE RECOGNITION - Schedule of Changes in Contract Asset and Liability Balances (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Contract assets    
Contract assets, beginning $ 0 $ 36
Contract assets at beginning of year transferred to accounts receivable 0 0
Contract assets recorded on contracts during the period 0 13
Contract assets, ending 0 49
Contract liabilities    
Contract liabilities, beginning 1,731 271
Recognition of revenue included in beginning of year contract liabilities (537) (112)
Contract liabilities, net of revenue recognized on contracts during the period 275 45
Foreign currently translation 0 0
Contract liabilities, ending $ 1,469 $ 204