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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net loss $ (29,783) $ (12,500)
Adjustments to reconcile net loss to net cash flows (used in) provided by operating activities:    
Share-based compensation 10,798 11,115
Depreciation expense 2,549 3,390
Bad debt expense 2,817 0
Amortization of intangible assets 519 647
Amortization of deferred financing costs 348 943
Non-cash lease expenses 931 724
Accretion of asset retirement obligation 69 57
(Gain) loss on fixed asset disposal (17) 236
Increase (decrease) in cash resulting from changes in:    
Accounts receivable (3,295) (1,113)
Inventory (2,586) (835)
Prepaid expenses 1,467 3,527
Income taxes (13) 9,420
Other assets (287) 1,990
Accounts payable 1,090 (828)
Accrued compensation 495 2,085
Accrued expenses 1,724 (16,768)
Other liabilities 905 (840)
Net cash flows (used in) provided by operating activities (12,269) 1,250
Cash flows from investing activities:    
Purchases of equipment (847) (2,893)
Patent application costs (128) (263)
Principal payments from note receivable 0 75
Proceeds from sale of equipment 24 0
Net cash flows used in investing activities (951) (3,081)
Cash flows from financing activities:    
Stock repurchased for tax withholdings on vesting of restricted stock (1,191) (4,751)
Proceeds from exercise of stock options 574 1,404
Principal payments on finance lease (29) (27)
Net cash flows used in financing activities (646) (3,374)
Net change in cash (13,866) (5,205)
Cash and cash equivalents, beginning of period 87,083 95,812
Cash and cash equivalents, end of period $ 73,217 $ 90,607