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Collaboration Agreements - MIT (Narrative) (Details) - Spark License Agreement | 3 Months Ended
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Mar. 31, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Contractual payments defined in the Exclusive Patent License agreement | $ 0
MIT |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Contractual payments defined in the Exclusive Patent License agreement | 2,200,000
License and option agreement, payments made relative to calculated premium paid for initial equity investment made under the purchase agreement | $ 400,000

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