Commitments and Contingencies (Details) - USD ($) $ in Millions |
2 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Jun. 15, 2012 |
Feb. 26, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Oak Ridge National Laboratory [Member] | ||||
| Commitments and Contingencies (Details) [Line Items] | ||||
| Purchase of materials | $ 0.2 | $ 0.2 | ||
| Oak Ridge National Laboratory [Member] | Subsequent Event [Member] | ||||
| Commitments and Contingencies (Details) [Line Items] | ||||
| Purchase of materials | $ 0.3 | |||
| License and Sponsored Research Agreement [Member] | Fred Hutchinson Cancer Research Center [Member] | ||||
| Commitments and Contingencies (Details) [Line Items] | ||||
| Milestone payment | $ 1.0 | |||
| Description of royalty payment | royalty payments of 2% of net sales will be due to FHCRC. | |||