General form of registration statement for all companies including face-amount certificate companies

Revenue Recognition - Disaggregated Revenue by Source (Details)

v3.19.3.a.u2
Revenue Recognition - Disaggregated Revenue by Source (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Aug. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Aug. 31, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                              
Net revenue $ 36,289 $ 84,589 $ 134,436 $ 137,156 $ 135,013 $ 133,753 $ 133,546 $ 138,211 $ 140,498 $ 141,200 $ 342,286 $ 405,922 $ 540,358 $ 553,455 $ 570,372
Alarm monitoring revenue                              
Disaggregation of Revenue [Line Items]                              
Net revenue 33,594 78,608   125,004             319,172 374,689 498,236 537,399 552,590
Product and installation revenue                              
Disaggregation of Revenue [Line Items]                              
Net revenue 2,224 4,993   11,360             19,111 28,984 38,455 12,308 13,264
Other revenue                              
Disaggregation of Revenue [Line Items]                              
Net revenue $ 471 $ 988   $ 792             $ 4,003 $ 2,249 $ 3,667 $ 3,748 $ 4,518