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Commitments and Contingencies - Additional Information (Details) |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 15, 2018 plaintiff | Sep. 08, 2017 USD ($) | Nov. 02, 2016 patent | Apr. 21, 2016 patent | Sep. 30, 2018 USD ($)
Siemens Industry, Inc. | Pending Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Patents allegedly infringed | patent |  |  | 6 | 7 |
Subsidiaries | Denver Transit, Delivery of Train Management System | Threatened Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages alleged |  |  |  |  | $ 0
Subsidiaries | Denver Transit, Installation of Constant Wireless Crossings | Threatened Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Damages alleged |  | $ 36,800,000 |  |  |
Subsequent Event | Employee Competition Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of plaintiffs | plaintiff | 30 |  |  |  |

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