v3.23.1
Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (8,152) $ (8,674)
Adjustments to reconcile net loss to net cash used in operating activities:    
Non-cash interest income on liability related to royalty monetization 0 (673)
Depreciation and amortization 262 420
Non-cash interest expense related to debt financing 38 134
Stock-based compensation 569 783
Revaluation of warrant liability (5,311) 0
Impairment of net assets held for sale 7,007 0
Impairment of fixed assets 1,065 0
Gain on termination of lease liabilities (1,098) 0
Gain on extinguishment of debt liability (400) 0
Other (15) 2
Changes in operating assets and liabilities:    
Accounts receivable 33 (24)
Inventories 61 57
Prepaid expenses and other assets 1,550 360
Accounts payable 100 249
Accrued liabilities (960) (1,512)
Operating lease liabilities 30 (56)
Deferred revenue (29) 0
Net cash used in operating activities (5,250) (8,934)
Cash flows from investing activities:    
Purchase of property and equipment (100) (89)
Purchase of investments 0 (6,175)
Cash paid for asset acquisition, net of cash acquired 0 (1,156)
Proceeds from maturities of investments 500 27,596
Net cash provided by investing activities 400 20,176
Cash flows from financing activities:    
Payment of long-term debt (2,083) (2,083)
Net proceeds from issuance of common stock in connection with exercise of prefunded warrants 2 0
Net proceeds from issuance of common stock through equity plans 31 58
Payment of employee tax obligations related to vesting of restricted stock units (22) (58)
Net cash used in financing activities (2,072) (2,083)
Net change in cash, cash equivalents and restricted cash (6,922) 9,159
Cash, cash equivalents and restricted cash—Beginning of period 20,275 12,663
Cash, cash equivalents and restricted cash—End of period 13,353 21,822
NONCASH INVESTING ACTIVITIES:    
Purchases of property and equipment in accounts payable and accrued liabilities 0 1,275
Asset acquisition costs in accounts payable and accrued liabilities 0 531
Liability for hold back shares in connection with asset acquisition in other long-term liabilities 0 800
Issuance of common stock in connection with asset acquisition $ 0 $ 5,511