REVENUE Revenue from Contract with Customer (Tables)

12 Months Ended

Dec. 31, 2018

Capitalized Contract Cost [Line Items]

Contract with Customer, Asset and Liability [Table Text Block]

Contract Asset

Contract asset activity for the year ended December 31, 2018 was as follows (in thousands):

	December 31, 2018
Contract asset at January 1, 2018	$	6,579
Revenue in excess of billings	34,504
Customer billings	(24,570		)
Contract asset at December 31, 2018	$	16,513

The increase in contract assets during the year ended December 31, 2018 is due to (i) continued growth in our subscription offerings and (ii) the timing of payments due under our enterprise network agreements which predominately are payable annually whereas performance obligations are fulfilled on a continuous basis.