Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities
Net loss	$ (10,057)	$ (9,253)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss (gain) from change in fair value of derivative warrant liability	53	(7)
Loss from change in fair value of 2020/21 Notes embedded derivative liability		100
Stock-based compensation	925	172
Depreciation and amortization	1,149	1,649
Non-cash lease expense	17	15
Non-cash interest expense	2	150
Changes in operating assets and liabilities:
Accounts receivable	435	983
Inventories	39	520
Prepaid expenses and other current assets, deposits and other assets	(4,273)	(167)
Accounts payable, accrued expenses and long-term liabilities	4,545	(1,137)
Net cash used in operating activities	(7,165)	(6,975)
Investing Activities
Acquisitions of property, plant and equipment	(5,432)	(801)
Net cash used in investing activities	(4,630)	(790)
Financing Activities
Debt and equity offering costs	(31,683)	(52)
Proceeds from issuance of common stock and common stock warrants	489,373	958
Proceeds from exercise of warrants	1,117
Payment of loans payable - other	(27)	(154)
Net cash provided by financing activities	458,780	752
Net increase (decrease) in cash and cash equivalents	446,985	(7,013)
Beginning of period	78,338	16,302
End of period	525,323	9,289
Cash paid for interest	3	395
Non-cash purchase of property, plant and equipment	999	380
Original issue discount paid with 2020/21 Notes		282
Right-of-use asset purchased with financing lease		13
Right-of-use asset purchased with operating lease	$ 1,562