Other Long-Term Assets (Tables)

12 Months Ended

Dec. 31, 2019

Other Long-Term Assets [Abstract]

Schedule of Other Assets, Noncurrent [Table Text Block]

	December 31,
	2018		2019
Deferred tax assets	$	2,965	$	2,808
Long-term unbilled receivables		-		362
Other		1,327		2,091
	$	4,292	$	5,261