CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (49,021)	$ (39,383)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,100	1,019
Charges to provision for doubtful accounts	274	230
Inventory charge	73	502
Debt financing fees	9,048	1,272
Loss on extinguishment of debt	8,380
Share-based compensation	2,062	2,957
Other	(7)	216
Changes in operating assets and liabilities:
Accounts receivable	489	(1,567)
Inventory	(1,418)	145
Prepaid and other current assets	888	(817)
Accounts payable	435	(10,758)
Accrued expenses and other current liabilities	(1,829)	7,804
Total adjustments	19,495	1,003
Net cash used in operating activities	(29,526)	(38,380)
Cash flows from investing activities:
Payment of patent related costs	(170)	(375)
Purchase of fixed assets	(42)	(63)
Net cash used in investing activities	(212)	(438)
Cash flows from financing activities:
Proceeds from sale of common stock, net of costs		150,899
Proceeds from exercise of options and warrants		50
Repayments of debt	(5,000)	(50,000)
Payment of debt financing fees		(5,000)
Net cash (used in) provided by financing activities	(5,000)	95,949
Net (decrease) increase in cash	(34,738)	57,131
Cash, beginning of period	65,122	80,486
Cash, end of period	30,384	137,617
Supplemental disclosure of cash flow information:
Interest paid	5,364	$ 8,955
Supplemental disclosure of noncash financing activities:
Paid in kind ("PIK") debt financing fees with corresponding increase in debt	$ 30,000