Condensed Consolidated Statement of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (32,858)	$ (27,242)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	63	38
Gain on sale of ELAD Assets	0	(329)
Gain on disposal of equipment	0	(26)
Stock-based compensation	1,429	6,182
Contingent payment settled in common stock	0	1,540
Changes in operating assets and liabilities:
Other current assets and prepaid expenses	(1,234)	(3,458)
Accounts payable	875	918
Other current liabilities	(1,208)	(49)
Accrued expenses	772	146
Net cash used in operating activities	(32,161)	(22,280)
Cash flows from investing activities:
Cash distribution in connection with ELAD Assets sale	0	(75)
Proceeds from sale of ELAD Assets	0	2,475
Cash acquired in connection with the Transaction	0	8,151
Purchases of property and equipment	(122)	(30)
Proceeds from sale of equipment	0	40
Net cash (used in) provided by investing activities	(122)	10,561
Cash flows from financing activities:
Proceeds from public offering of common stock through At The Market offering, net of issuance costs of $112 and $53, respectively	2,814	305
Deferred financing costs	0	(82)
Net cash provided by financing activities	136,320	30,188
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(223)	(1,081)
Net change in cash, cash equivalents and restricted cash	103,814	17,388
Cash, cash equivalents and restricted cash, beginning of period	29,369	13,072
Cash, cash equivalents and restricted cash, end of period	133,183	30,460
Supplemental disclosures for cash flow information:
Cash paid for interest	0	2
Supplemental disclosure of noncash investing and financing activities:
Conversion of convertible preferred stock to common stock	0	37,193
Fair value of net assets acquired in the Transaction	0	39,400
Offering costs in accrued expenses	25	140
Pre-Closing Financing
Cash flows from financing activities:
Proceeds from issuance of common stock	0	29,965
April 2020 Equity Issuances
Cash flows from financing activities:
Proceeds from issuance of common stock	13,918	0
June 2020 Equity Issuances
Cash flows from financing activities:
Proceeds from issuance of common stock	23,048	0
August 2020 Equity Issuances
Cash flows from financing activities:
Proceeds from issuance of common stock	$ 96,540	$ 0