Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (37,817)	$ (29,528)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation	381	265
Amortization of deferred loan costs	766	81
Amortization of debt discount	296	3,856
Interest expense added to loan principal	7,270	10,031
Interest expense added to lease liability	1,451	1,272
Loss on equity method investments	2,169	490
Loss on debt conversion and extinguishment of debt	12,394	38
Debt conversion expense	(0)	197
Compensation charge for stock awards and share options	2,096	562
Unrealized gain on warrant derivative liabilities	(139)	0
Changes in operating assets and liabilities:
Accounts receivable	(6)	(11)
Prepaid expenses and other current assets	(305)	22
Other assets	(605)	(186)
Accounts payable	129	(68)
Accrued and other liabilities	(1,508)	(729)
Net cash used for operating activities	(13,428)	(13,708)
Cash flows from investing activities:
Additions to property, plant and equipment	(5,729)	(1,599)
Contributions to equity-method investments	(3,109)	(904)
Additions to long-term investments	(1,000)	0
Net cash used for investing activities	(9,838)	(2,503)
Cash flows from financing activities:
Net proceeds from issuance of common stock	14,767	19,395
Proceeds from the issuance of long-term debt	150	0
Principal payments on long-term debt	(43)	(59)
Net cash provided by financing activities	14,874	19,336
Net (decrease) increase in cash and cash equivalents and restricted cash	(8,392)	3,125
Cash and cash equivalents and restricted cash, beginning of period	15,816	12,691
Cash and cash equivalents and restricted cash, end of period	$ 7,424	$ 15,816