Annual report pursuant to Section 13 and 15(d)

Revenue Recognition - Disaggregated Revenue by Source (Details)

v3.19.1
Revenue Recognition - Disaggregated Revenue by Source (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Total Net revenue $ 134,436 $ 137,156 $ 135,013 $ 133,753 $ 133,546 $ 138,211 $ 140,498 $ 141,200 $ 540,358 $ 553,455 $ 570,372
Alarm monitoring revenue                      
Disaggregation of Revenue [Line Items]                      
Total Net revenue                 498,236 537,399 552,590
Product and installation revenue                      
Disaggregation of Revenue [Line Items]                      
Total Net revenue                 38,455 12,308 13,264
Other revenue                      
Disaggregation of Revenue [Line Items]                      
Total Net revenue                 $ 3,667 $ 3,748 $ 4,518