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Fair Value Measurement - Fair Value Measurements Change in Level 3 Inputs (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value Disclosures [Abstract] |  |  |  |
Proceeds investment agreement |  |  | $ 9,142,000 |
Repayment of obligation |  |  | (6,000,000) |
Change in fair value | $ (2,961,000) |  | (3,098,000) |
Proceeds investment agreement | $ 6,240,000 |  | $ 6,240,000 |

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