| Schedule of components of property and equipment |
| | | June 30, | | | December 31, | | | | | 2017 | | | 2016 | | | Computer, network and other equipment | | $ | 8,840 | | | $ | 8,805 | | | Monitoring equipment | | | 6,836 | | | | 5,692 | | | Furniture and fixtures | | | 486 | | | | 486 | | | Leasehold improvements | | | 254 | | | | 264 | | | Total property and equipment | | | 16,416 | | | | 15,247 | | | Accumulated depreciation and amortization | | | (10,689 | ) | | | (9,225 | ) | | | | $ | 5,727 | | | $ | 6,022 | |
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