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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net loss $ (12,500) $ (32,704)
Adjustments to reconcile net loss to net cash flows provided by (used in) operating activities:    
Share-based compensation 11,115 11,452
Depreciation 3,390 4,494
Amortization of intangible assets 647 818
Amortization of deferred financing costs 943 1,811
Non-cash lease expenses 724 702
Accretion of asset retirement obligation 57 0
Loss on fixed asset disposal 236 0
Loss on extinguishment of debt 0 8,201
Increase (decrease) in cash resulting from changes in:    
Accounts receivable (1,113) (715)
Inventory (835) (1,919)
Prepaid expenses 3,527 5,177
Income taxes 9,420 (10,835)
Other assets 1,990 1,633
Accounts payable (828) 339
Accrued compensation 2,085 (2,775)
Accrued expenses (16,768) (4,835)
Other liabilities (840) (840)
Net cash flows provided by (used in) operating activities 1,250 (19,996)
Cash flows from investing activities:    
Purchases of equipment (2,893) (2,073)
Principal payments from note receivable 75 0
Patent application costs (263) (209)
Net cash flows used in investing activities (3,081) (2,282)
Cash flows from financing activities:    
Proceeds from exercise of stock options 1,404 370
Stock repurchased for tax withholdings on vesting of restricted stock (4,751) (2,409)
Principal payments on finance lease (27) 0
Deferred financing cost 0 (2,782)
Repayment of term loans 0 (83,872)
Proceeds from term loans 0 59,500
Proceeds from sale of Series B convertible preferred stock 0 100,000
Stock issuance costs 0 (6,564)
Prepayment premium on early repayment of term loan 0 (1,439)
Net cash flows (used in) provided by financing activities (3,374) 62,804
Net change in cash (5,205) 40,526
Cash and cash equivalents, beginning of period 95,812 69,069
Cash and cash equivalents, end of period $ 90,607 $ 109,595