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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue From Contract With Customer [Abstract] |
Summary of Revenues by Revenue Stream | We derive our revenues primarily from the following revenue streams (in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Recurring revenues: |  |  |  |  |  |  |  |  |  |  |  |
Fulfillment |  | $ | 190,783 |  |  | $ | 164,682 |  |  | $ | 139,645 |
Analytics |  |  | 34,447 |  |  |  | 34,260 |  |  |  | 32,938 |
Other |  |  | 5,424 |  |  |  | 4,978 |  |  |  | 4,474 |
Recurring Revenues |  |  | 230,654 |  |  |  | 203,920 |  |  |  | 177,057 |
One-time revenues |  |  | 17,586 |  |  |  | 16,165 |  |  |  | 16,096 |
|  | $ | 248,240 |  |  | $ | 220,085 |  |  | $ | 193,153 |
Summary of Deferred Revenue Liability Relating to Set-Up Fees | The table below presents the activity of the portion of the deferred revenue liability relating to set-up fees (in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |
Balances, at beginning of period |  | $ | 10,031 |  |  | $ | 9,995 |
Invoiced set-up fees |  |  | 10,271 |  |  |  | 10,625 |
Amortized set-up fees |  |  | (10,445 | ) |  |  | (10,589 | )
Balances, at end of period |  | $ | 9,857 |  |  | $ | 10,031 |

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