Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2019

Revenue from Contracts with Customer [Abstract]

Schedule of Allowance for Doubtful Accounts [Table Text Block]

The changes in our allowance for doubtful accounts consist of the following (amounts in thousands):

	Year ended December 31,
	2019			2018
Balance at beginning of year	$	1,423		$	1,224
Increase (decrease) in allowance charged to expense	(167		)	271
Accounts charged against the allowance	(432		)	(72		)
Balance at end of year	$	824		$	1,423

Schedule of Deferred Revenues and Costs [Table Text Block]

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

	As of December 31,
	2019		2018
Current deferred revenues	$	1,339	$	1,722
Current deferred costs	1,071		1,543
Noncurrent deferred revenues	$	57	$	437
Noncurrent deferred costs	267		679

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

Amortization of deferred revenues and costs during the years ended December 31, 2019 and 2018 were as follows (amounts in thousands):

	Year ended December 31,
	2019		2018
Amortization of deferred revenues	$	6,203	$	2,961
Amortization of deferred costs	4,786		2,855