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11. Fair Value Measurements (Details 2) - Level 3 - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Revenue - based payments | $ 13 | $ 175
Valuation technique | Discounted cash flow | Discounted cash flow
Unobservable inputs | Discount rate | Discount rate
Range | 3.67% | 3.67%
Probability of milestone payment | 100.00% | 90.00%
Projected year of payments | 2020 | 2020

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