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Balance Sheet Components - Future Amortization (Details)
Dec. 31, 2018
USD ($)
Estimated future amortization  
2019 $ 1,686,667
2020 1,686,667
2021 1,686,667
2022 1,686,667
2023 1,686,667
Thereafter 14,477,222
Total $ 22,910,557