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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Impairment of other assets | $ 0 | $ 67 | $ 86 | $ 86 |
Other Payments | Contingent Receivable |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Remaining contingent receivable asset | 308 |  | 308 |  | $ 760
Contingent Receivable | Contingent Consideration |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain (loss) on contingent receivable | 167 |  | 299 |  |
Payment received on contingent receivable | 0 |  | 153 |  |
Other long-term obligations |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, noncurrent | 9,800 |  | 9,800 |  | 10,700
Accrued expenses |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, current | $ 280 |  | $ 280 |  | 289
Other assets (long-term) | Contingent Receivable | Contingent Consideration |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Remaining contingent receivable asset |  |  |  |  | 319
Other current assets | Contingent Receivable | Contingent Consideration |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Remaining contingent receivable asset |  |  |  |  | $ 441

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