Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (55,783)	$ (66,246)
Adjustments to reconcile net loss to net cash (used for) operating activities:
Depreciation, amortization, and impairment	3,443	2,905
Share-based compensation	6,581	7,071
Amortization of debt issuance costs and discounts	2,587	1,929
Interest expense related to the sale of future revenue	1,938	0
Loss on the extinguishment of debt	0	4,896
All other non-cash expenses	188	359
Changes in operating assets and liabilities:
Trade receivables and other receivables, net	6,175	(6,815)
Inventories	398	2,582
Prepaid expenses and other assets	(7,953)	(1,366)
Accounts payable	(5,185)	(7,872)
Accrued expenses and other liabilities	2,980	746
Deferred revenue	(828)	1,601
Net cash used for operating activities	(45,459)	(60,210)
Cash flows from investing activities:
Capital expenditures	(517)	(663)
Net cash used for investing activities	(517)	(663)
Cash flows from financing activities:
Proceeds from issuance of common stock and warrant exercises	6,215	39,317
Proceeds from sale of future revenue	50,000	0
Proceeds from issuance of debt	0	70,000
Debt repayment	(22,500)	(50,000)
Payments for financing costs	(2,909)	(3,946)
Premium paid to retire debt	(2,250)	(2,944)
Payments for taxes on share-based compensation	(99)	(2,827)
Net cash provided by financing activities	28,457	49,600
Net decrease in cash and cash equivalents	(17,519)	(11,273)
Cash and cash equivalents:
Beginning of period	49,326	60,599
End of period	31,807	49,326
Supplemental disclosures of cash flow information:
Cash payments for interest	8,491	7,340
Net increase (decrease) in capital expenditures included in accounts payable and accrued expenses	(77)	104
Deferred financing costs charged to additional paid in capital	473	540
Warrants issued in connection with long-term debt	735	6,800
Debt issued in lieu of prepayment penalty	$ 4,000	$ 0