Revenue (Details Narrative) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Sale of equipment estimated life	3 years		2 years
Prepayment of monitoring fees	Revenues from the prepayment of monitoring fees (generally paid twelve months in advance) are initially recorded as deferred revenue upon receipt of payment from the customer and then amortized to revenue over the monitoring service period.
Revenue	$ 1,327	$ 1,209
Other current assets	136			$ 144
Capitalized Sales Commissions [Member]
Other current assets	70			76
Other assets	69			$ 67
Other Revenue Related to Accessories, Repairs and Other Miscellaneous Charges [Member]
Revenue	$ 87