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Supplemental Consolidated Financial Statement Information - Disaggregated Revenues, Deferred Costs and Deferred Revenue (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Number of business segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Operating revenues | $ 27,670,000 | $ 40,448,000 | $ 36,158,000 | $ 49,880,000 | $ 37,418,000 | $ 45,108,000 | $ 31,640,000 | $ 42,366,000 | $ 154,156,000 | $ 156,532,000 | $ 137,640,000
Deferred cost |  |  |  |  | 2,991,000 |  |  |  |  | 2,991,000 | 3,668,000
Deferred costs incurred to fulfill contracts with customers | 6,994,000 |  |  |  |  |  |  |  | 6,994,000 |  |
Total deferred costs amortized |  |  |  |  |  |  |  |  | 36,615,000 | 39,980,000 |
Deferred revenue | $ 10,501,000 |  |  |  | $ 6,314,000 |  |  |  | 10,501,000 | 6,314,000 | 5,385,000
Revenue recognized that was included in deferred revenue balances at beginning of period |  |  |  |  |  |  |  |  | 5,945,000 | 5,381,000 |
United States |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 137,101,000 | 134,442,000 | 126,832,000
Canada |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | $ 17,055,000 | $ 22,090,000 | $ 10,808,000

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