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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (11,807) $ (14,455)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 66 77
Non-cash operating lease cost 80 10
(Gain) loss on fair value remeasurement of deferred purchase consideration   (230)
Loss (gain) on fair value remeasurement of contingent consideration 158 1,847
Amortization of debt discount and other non-cash interest 312 329
Stock-based compensation 2,376 1,324
Other non-cash losses 17  
Change in operating assets and liabilities:    
Accounts receivable   80
Prepaid expenses and other current assets 378 5,470
Inventory and assets held for sale   2,189
Accounts payable (187) (1,826)
Accrued expenses and other current liabilities (2,164) (4,489)
Lease liabilities and other long-term liabilities (73) (10)
Net cash used in operating activities (10,844) (9,684)
Cash flows from investing activities:    
Purchases of property and equipment and other assets (13) (108)
Net cash (used in) provided by investing activities (13) (108)
Cash flows from financing activities:    
Payment of principal, prepayment premium and final payment fee on debt   (10,000)
Proceeds from issuance of Series G preferred stock, net of issuance costs of $62 8,538  
Proceeds from common stock offerings, net of offering costs   14,893
Contingent consideration related to Combangio acquisition (119) (2,041)
Proceeds from exercise of stock options and issuance of common stock under employee stock purchase plan 21 6
Payment of issuance costs (62)  
Net cash provided by (used in) financing activities 8,440 2,858
Net decrease in cash, cash equivalents and restricted cash: (2,417) (6,934)
Cash, cash equivalents and restricted cash at beginning of period 50,895 70,745
Cash, cash equivalents and restricted cash at end of period 48,478 63,811
Reconciliation of cash, cash equivalents and restricted cash:    
Cash, cash equivalents, and restricted cash at end of period 48,478 63,811
Less restricted cash   (175)
Cash and cash equivalents at end of period 48,478 63,636
Non-cash investing and financing activities:    
Purchases of property and equipment in accounts payable and accrued expenses   67
Issuance of common stock to satisfy deferred purchase consideration in additional paid-in capital   365
Issuance of common stock to satisfy contingent consideration in additional paid-in capital   2,354
Issuance of common stock to satisfy service contract in additional paid-in capital 29  
Transaction costs included in accrued expenses 62  
Supplemental disclosure:    
Cash paid for interest $ 1,144 $ 1,227