Revenues and Trade Receivables, Net, Summary of Activity with Sales Related Allowances and Accruals (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Revenues and Trade Receivables, Net [Roll Forward]
Beginning balance	$ 585
Provision related to sales during the period	423
Reversals of prior provisions	(89)
Credits and payments	(225)
Ending balance	694
Provision related to sales after reversals of prior provisions	334
Accrued balances - Trade and other receivables, net	53	$ 104
Accrued balances - Accounts payable and accrued expense	$ 641	$ 481