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Description of Business and Significant Accounting Policies - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |
Number of reportable segments | segment | 1 |  |
Maximum reimbursement per claim occurrence | $ 1,000 |  |
Plan years to be settled | 10 years |  |
Prepaid Insurance | $ 33,000 | $ 19,000 |
Prepaid insurance premiums |  | 11,000 |
Advance collection | 23,000 | 12,000 |
Internally developed software costs | 33,000 | 29,000 | $ 21,000
Impairment of goodwill | 0 | 0 | 0
Advertising costs | 17,000 | 8,000 | 6,000
Bad Debt Expense Net Of Recoveries | $ 1,000 | $ 1,000 | $ 1,000
Minimum |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of intangible assets | 2 years |  |
Minimum | Software Development |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of intangible assets | 3 years |  |
Minimum | Software And Office Equipment |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of property and equipment | 3 years |  |
Minimum | Furniture, fixtures, and equipment |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of property and equipment | 5 years |  |
Maximum |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of intangible assets | 10 years |  |
Maximum | Software Development |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of intangible assets | 5 years |  |
Maximum | Software And Office Equipment |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of property and equipment | 5 years |  |
Maximum | Furniture, fixtures, and equipment |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Estimated useful life of property and equipment | 7 years |  |
Customer Concentration Risk | Accounts Receivable | Largest Customer |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Concentration risk percentage | 10.00% | 47.00% |
Concentration Risk, Customer | no | 1 |
Customer Concentration Risk | Revenue | Largest Customer |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% | 10.00%
Concentration Risk, Customer | 0 | 0 | 0
Non-US | Geographic Concentration Risk | Revenue |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |
Concentration risk percentage | 1.00% |  |

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