Revenue Recognition - Schedule of Deferred Revenue (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 15,556,000	$ 14,324,000
Less: Current portion	6,996,000	7,383,000
Deferred revenue - less current portion	8,560,000	6,941,000
Deferred Activation Fees [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	429,000	466,000
Deferred Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	85,000	489,000
Deferred Maintenance and Hosting Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	3,709,000	3,377,000
Deferred Remote Asset Management Product Revenue [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 11,333,000	$ 9,992,000