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Fair Value Measurement - Level 3 Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Accounts payable and accrued expenses |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Short-term portion of deferred payments | $ 1,600 |
Deferred payments |  |
Schedule of changes in fair value of level 3 liability |  |
Balance at beginning of year | 4,120 | $ 4,514
Amounts paid | (1,579) | (1,412)
Other adjustments to fair value | 716 | 1,018
Balance at end of year | $ 3,257 | $ 4,120

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