| 4 | Statement of changes in beneficial ownership of securities | April 1, 2021 | |
| 10-K | Annual report [Section 13 and 15(d), not S-K Item 405] | March 18, 2021 | |
| 8-K | Current report | February 23, 2021 | |
| 8-K | Current report | January 27, 2021 | |
| SC 13G | Statement of acquisition of beneficial ownership by individuals | January 25, 2021 | |
| D | Notice of Exempt Offering of Securities | January 5, 2021 | |
| 8-K | Current report | January 5, 2021 | |
| 8-K | Current report | December 28, 2020 | |
| 8-K | Current report | December 18, 2020 | |
| 8-K | Current report | December 8, 2020 | |