Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2019

Revenue from Contracts with Customer [Abstract]

Schedule of Deferred Revenues and Costs [Table Text Block]

Our current and noncurrent deferred revenues and costs as ofJune 30, 2019 and December 31, 2018were as follows (amounts in thousands):

	June 30, 2019		December 31, 2018
Current deferred revenues	$	1,420	$	1,722
Current deferred costs	978		1,543
Noncurrent deferred revenues	$	313	$	437
Noncurrent deferred costs	581		679

Schedule of Amortization of Deferred Revenue and Costs [Table Text Block]

Amortization of deferred revenues and costs during the three and six months ended June 30, 2019 and 2018 were as follows (amounts in thousands):

	Three months ended June 30,				Six months ended June 30,
	2019		2018		2019		2018
Amortization of deferred revenues	$	1,280	$	542	$	2,235	$	1,041
Amortization of deferred costs	1,110		486		2,096		949