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Significant Accounting Policies - Revenue (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Accumulated deficit | $ (677,320,000) |  | $ (665,584,000) | $ (667,357,000)
Revenues | 99,403,000 | $ 117,518,000 |  |
Total revenues | 99,403,000 | 117,518,000 |  |
Revenue recognized | 5,500,000 |  |  |
Unamortized balance of deferred commissions | 800,000 |  |  |
Capitalized contract cost, amortization | 100,000 |  |  |
Capitalized contract cost, impairment | 0 |  |  |
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 89,389,000 | 106,528,000 |  |
Caribbean |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,137,000 | 947,000 |  |
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 2,286,000 | 1,512,000 |  |
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,227,000 | 1,577,000 |  |
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5,364,000 | $ 6,954,000 |  |
Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Accumulated deficit |  |  | $ 1,800,000 |
Revenues | $ 1,200,000 |  |  |

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