Contract Assets and Contract Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Contract assets, beginning	$ 56
Reductions	(128)	[1]
Additions	124	[2]
Contract assets, ending	52
Net contract assets (liabilities), beginning	(219)
Reductions	114	[1]
Additions	(136)	[2]
Net contract assets (liabilities), ending	(241)
Open Projects [Member]
Contract liabilities, beginning	101	[3]
Reductions	(180)	[1],[3]
Additions	217	[2],[3]
Contract liabilities, ending	138	[3]
Other Customer Deposits [Member]
Contract liabilities, beginning	174	[4]
Reductions	(62)	[1],[4]
Additions	43	[2],[4]
Contract liabilities, ending	$ 155	[4]

[1] For contract assets, the amount represents amount billed to the customer. For contract liabilities, the amount represents reductions for revenue recognized.

[2] For contract assets, the amount represents revenue recognized during the period using the cost-to-cost method. For contract liabilities, the amount represents advance payments received during the period.

[3] Contract liabilities from ongoing consulting projects.

[4] Other customer deposits include payments received for orders not fulfilled and other advance payments.