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Convertible Debt Instruments - Issuance (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) instrument
Convertible Debt Instruments |  |
Types of convertible debt instruments issued | instrument |  | 2
Proceeds from issuance of convertible debt instruments | $ 152 | $ 7,998
Convertible debt instruments |  |
Convertible Debt Instruments |  |
Proceeds from issuance of convertible debt instruments |  | 8,000
Convertible debt instruments | Board of Directors and Executive Management |  |
Convertible Debt Instruments |  |
Proceeds from issuance of convertible debt instruments |  | $ 100

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