Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss - before noncontrolling interest (“NCI”)	$ (22,779)	$ (20,755)
Adjustments to reconcile net loss - before NCI to net cash used in operating activities
Depreciation expense	22	9
Stock-based compensation	6,639	872
Amortization expense	6
In-process R&D charge	133
Change in fair value - Senior Secured Convertible Notes and Senior Convertible Note	(1,682)	5,888
Debt extinguishment loss - Senior Secured Convertible Notes and Senior Convertible Note	3,715	3,937
Debt forgiveness	(300)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,441)	(747)
Accounts payable	650	1,295
Accrued expenses and other current liabilities	(759)	155
Net cash flows used in operating activities	(15,796)	(9,346)
Cash flows from investing activities
Purchase of equipment	(157)	(44)
Acquisition, net of cash acquired	(47)
Net cash flows used in investing activities	(204)	(44)
Cash flows from financing activities
Proceeds – issue of common stock – registered offerings	55,016
Payment – offering costs – registered offerings	(1,312)
Proceeds – issue of Senior Secured Convertible Notes		6,300
Proceeds – issue of Senior Convertible Note		3,700
Proceeds – Cares Act Paycheck Protection Program Loan		300
Payment – repayment of Senior Convertible Note and Senior Secured Convertible Note	(14,816)
Payment – Senior Convertible Note and Senior Secured Convertible Note – non-installment payments	(154)	(192)
Proceeds – exercise of Series Z warrants	2,785
Proceeds – exercise of Series S Warrants		12
Proceeds – issue common stock – Employee Stock Purchase Plan	304	126
Proceeds – exercise of stock options	131
Proceeds – exercise of stock options issued under equity incentive plan of majority owned subsidiary		5
Net cash flows provided by financing activities	41,954	10,251
Net increase (decrease) in cash	25,954	861
Cash, beginning of period	17,256	6,219
Cash, end of period	$ 43,210	$ 7,080