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Balance Sheet Components - Summary of Platform Development Cost Activity (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Stock-based compensation | $ 7,343,575 | $ 3,959,925 |
Platform Development [Member] |  |  |
Platform development beginning of period | 10,678,692 | $ 6,833,900 | $ 6,833,900
Payroll-based costs capitalized during the period | 2,061,081 |  | 2,537,402
Total capitalized costs | 12,739,773 |  | 9,371,302
Stock-based compensation | 869,663 |  | 1,307,390
Platform development end of period | $ 13,609,436 |  | $ 10,678,692

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