Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flows from Operating Activities:
Net loss	$ (1.1)	$ (0.8)
Adjustments to reconcile net loss to net cash used in operating activities:
Payment-in-Kind interest	0.1	0.1
Changes in operating assets and liabilities	0.4
Net cash used in operating activities	(0.6)	(0.7)
Cash Flows from Investing Activities:
Purchase of investments		(0.2)
Net cash used in investing activities		(0.2)
Cash Flows from Financing Activities:
Net cash provided by financing activities
Net change in cash and cash equivalents	(0.6)	(0.9)
Cash and cash equivalents — beginning of period	1.2	4.1
Cash and cash equivalents — end of period	0.6	3.2
Supplemental disclosures of cash paid during the period:
Interest expense		0.1
Non-cash investing and financing activities during the period:
Marketable securities received from Arrive distribution	$ 0.3