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Fair Value of Financial Instruments (Details) - Recurring - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Level 1 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Total Assets |  |  | $ 5 | $ 10,024
Level 1 | Money market funds |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Cash and cash equivalents |  |  | 5 | 10,024
Level 3 |  |  |  |
Fair Value of Financial Instruments |  |  |  |
Contingent consideration liability | $ 549 | $ 773 | 3,375 | 549
Total Liabilities |  |  | $ 3,375 | $ 549
Summary of changes in contingent consideration liability |  |  |  |
Beginning balance | 549 | 773 |  |
Acquisitions | 2,357 |  |  |
Remeasurement of acquisition-related contingent consideration | (296) | 71 |  |
Accretion | 1,018 |  |  |
Payments | (299) | (292) |  |
Effects of foreign currency translation | 46 | (3) |  |
Ending balance | $ 3,375 | $ 549 |  |

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