Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net loss	$ (29,522)	$ (27,039)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation, amortization, and impairment	1,394	1,497
Share-based compensation	3,132	3,228
Amortization of debt issuance costs and discounts	109	2,388
Interest expense related to the sale of future revenue, net	3,722	6,729
Other, net	(161)	(125)
Changes in operating assets and liabilities:
Trade and other receivables, net	(6,949)	(5,392)
Inventories, net	(970)	(378)
Prepaid expenses and other assets	2,446	2,532
Accounts payable	574	1,011
Accrued expenses and other liabilities	(2,021)	(2,971)
Deferred revenue	7,202	2,667
Net cash used for operating activities	(21,044)	(15,853)
Investing activities:
Capital expenditures	(781)	(297)
Net cash used for investing activities	(781)	(297)
Financing activities:
Proceeds from common stock issued under public equity offering, net	2,473	18,505
Proceeds from common stock issued under private equity offering, net	3,805	0
Proceeds from issuance and exercise of warrants	5,878	0
Proceeds from shares issued under employee stock purchase plan	15	76
Premium paid to retire debt	675	0
Payments for taxes on share-based compensation	0	(4)
Net cash provided by financing activities	11,496	18,577
Net (decrease) increase in cash and cash equivalents	(10,329)	2,427
Cash and cash equivalents at beginning of period	28,024	31,807
Cash and cash equivalents at end of period	17,695	34,234
Supplemental disclosures of cash flow information:
Cash payments for interest	$ 1,609	$ 3,219