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Accounts Receivable, Net - Schedule of Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning of period balance |  |  | $ (4,696) |
(Provision for) / recovery of expected credit losses | $ (100) | $ 900 | (150) | $ (965)
End of period balance | (3,573) |  | (3,573) |
Alarm.com and Certain Subsidiaries |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning of period balance | (3,670) | (4,555) | (4,442) | (2,500)
(Provision for) / recovery of expected credit losses | (111) | 935 | (147) | (951)
Write-offs | 338 | 70 | 1,146 | 113
End of period balance | (3,443) | (3,550) | (3,443) | (3,550)
Alarm.com and Certain Subsidiaries | Impact of adopting Topic 326 |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning of period balance |  |  |  | (212)
All Other Subsidiaries |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning of period balance | (242) | (234) | (254) | (84)
(Provision for) / recovery of expected credit losses | (7) | (15) | (3) | (14)
Write-offs | 118 | 11 | 126 | 15
End of period balance | $ (131) | $ (238) | $ (131) | (238)
All Other Subsidiaries | Impact of adopting Topic 326 |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning of period balance |  |  |  | $ (155)

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