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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows used in operating activities:    
Net loss $ (20,090) $ (114,593)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 144 93
Stock-based compensation 2,538 3,302
Amortization of right-of-use asset 267 243
Impairment of right-of-use asset 772 0
Impairment of in-process research and development 5,990 0
In-process R&D acquired in Novellus asset acquisition 0 80,538
Transaction costs - shares to Financial Advisor 0 5,765
Loss on sale of NTN assets 0 9,648
Loss on disposal of fixed assets 431 13
Gain on forgiveness of PPP loan 0 (310)
Gain on lease termination (85) 0
Gain on lease warrant liabilities (10,493) 0
Loss on non-controlling investment 932 0
Changes in operating assets and liabilities:    
Other receivable (237) 5
Prepaid expenses and other current assets (575) (1,109)
Other non-current assets (331) (31)
Accounts payable and accrued expenses 1,376 (196)
Operating lease liability (223) (226)
Other liabilities 4,043 202
Net cash used in operating activities (15,541) (16,656)
Cash flows used in investing activities:    
Purchase of property and equipment (276) (7)
Purchase of Novellus, net of common stock issue and cash acquired 0 (22,854)
Proceeds from the sales of fixed assets 100 0
Purchase of NTN, net of cash acquired 0 147
Proceeds from the sale of NTN assets, net of cash disposed 0 119
Net cash used in investing activities (176) (22,595)
Cash flows provided by financing activities:    
Proceeds from issuance of common stock and warrants in connection with private offering 11,993 0
Issuance of common stock from exercise of pre-funded warrants 7 0
Payroll tax remitted on net share settlement of equity awards (5) 0
Dividends paid to Series A preferred stockholders (8) 0
Principal payments on finance leases (1) 0
Proceeds from issuance of common stock to Lincoln Park 0 54,106
Fees incurred in connection with the common stock issued to Lincoln Park 0 (2,080)
Proceeds from sale of members' equity 0 10,500
Proceeds from the exercise of stock options 0 10
Repayment of NTN's PPP loan 0 (532)
Net cash provided by financing activities 11,986 62,004
Net (decrease) increase in cash and cash equivalents (3,731) 22,753
Cash and cash equivalents at beginning of period 16,985 1,630
Cash and cash equivalents at end of period 13,254 24,383
Cash paid during the period for:    
Interest 25 13
Income taxes 8 0
Supplemental disclosure of non-cash investing and financing activities:    
Conversion of warrant liability to equity 867 0
Issuance of common stock for Series A preferred stock dividend 0 8
Issuance of common stock for business combination 0 8,177
Issuance of common Stock for Novellus acquisition 0 58,684
Series A preferred stock retained in business combination 0 1
Initial measurement of ROU assets, net of tenant improvement allowance 1,706 816
Initial measurement of operating lease liabilities 1,706 866
Initial measurement of finance lease liabilities $ 10 $ 0