CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (30,197)	$ (10,285)	$ (49,284)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	12,666	14,757	15,357
Depreciation	3,345	4,363	5,782
Bad debt expense	2,820	0	0
Non cash lease expenses	1,259	989	983
Amortization of intangible assets	701	820	1,073
Amortization of deferred financing costs and debt discount	467	1,055	2,276
Accretion of asset retirement obligation	92	81	10
(Gain) loss on fixed asset disposal	(17)	262	1
Impairment of intangible assets	0	53	1,027
Loss on extinguishment of debt	0	0	8,201
Increase (decrease) in cash resulting from changes in:
Accounts receivable	(5,550)	(4,930)	(3,096)
Inventory	(1,794)	(1,028)	(1,257)
Prepaid expenses	(2,500)	(542)	1,064
Other assets	(333)	675	(119)
Accounts payable	1,053	(326)	177
Accrued compensation	(1,744)	5,128	(2,459)
Accrued expenses	1,762	(21,197)	1,746
Income taxes	39	9,302	(10,027)
Other liabilities	38	(1,159)	(1,718)
Net cash flows used in operating activities	(17,893)	(1,982)	(30,263)
Cash flows from investing activities:
Purchases of property and equipment	(1,514)	(3,218)	(4,228)
Principal payments from note receivable	0	75	0
Proceeds from property and equipment sale	24	0	0
Net cash flows used in investing activities	(2,660)	(3,395)	(4,555)
Cash flows from financing activities:
Stock repurchased for tax withholdings on vesting of restricted stock	(1,190)	(4,751)	(2,334)
Proceeds from exercise of stock options	651	1,437	411
Payments under finance lease obligations	(41)	(38)	0
Proceeds from sale of Series B convertible preferred stock	0	0	100,000
Stock issuance costs	0	0	(7,470)
Proceeds from term loans	0	0	59,500
Deferred financing costs	0	0	(3,235)
Repayment of term loans	0	0	(83,872)
Prepayment premium on early repayment of term loan	0	0	(1,439)
Net cash flows (used in) provided by financing activities	(580)	(3,352)	61,561
Net change in cash	(21,133)	(8,729)	26,743
Cash and cash equivalents, beginning of year	87,083	95,812	69,069
Cash and cash equivalents, end of year	65,950	87,083	95,812
Licenses
Cash flows from investing activities:
Payments to acquire intangible assets	(1,000)	0	0
Patents and know-how
Cash flows from investing activities:
Payments to acquire intangible assets	$ (170)	$ (252)	$ (327)