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Commitments and Contingencies - State and Local Taxes and Surcharges (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) state | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expense | $ 8,767,000 | $ 4,679,000 | $ 6,845,000 | $ 8,860,000 | $ 6,511,000 | $ 6,143,000 | $ 5,882,000 | $ 6,536,000 |  | $ 29,151,000 | $ 25,072,000 | $ 25,822,000
Sales tax liability - current | 1,326,000 |  |  |  | 1,347,000 |  |  |  |  | 1,326,000 | 1,347,000 |
Contingent sales tax liabilities |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of states with sales tax liability | state |  |  |  |  |  |  |  |  | 4 |  |  |
General and administrative expense |  |  |  |  |  |  |  |  | $ 600,000 |  |  |
Payments on usage-based fees |  |  |  |  |  |  |  |  |  | 0 | 300,000 | 1,100,000
Sales tax liability expense (income) |  |  |  |  |  |  |  |  |  | (600,000) | (400,000) | $ 1,200,000
Sales tax liability | 1,500,000 |  |  |  | 2,100,000 |  |  |  |  | 1,500,000 | 2,100,000 |
Sales tax liability - current | $ 400,000 |  |  |  | $ 600,000 |  |  |  |  | $ 400,000 | $ 600,000 |

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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