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Condensed Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities    
Net loss $ (3,852) $ 1,899
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Stock-based compensation 1,661 1,657
Depreciation and amortization 513 385
Non-cash lease expense 36 39
Debt discount amortization 48 61
Changes in operating assets and liabilities:    
Accounts receivable (1,462) (1,232)
Inventories (1,157) (259)
Prepaid expenses and other assets 330 423
Accounts payable 284 537
Accrued liabilities 2,381 2,045
Net cash (used in) provided by operating activities (1,218) 5,555
Cash flows from investing activities    
Purchases of product license rights (1,868) 0
Purchases of property and equipment (14) 0
Net cash used in investing activities (1,882) 0
Cash flows from financing activities    
Repayment of long-term debt (770) (385)
Proceeds from employee stock purchase plan and stock option exercises 176 272
Payment of tax withholding related to net share settlement of stock option exercises 0 (181)
Net cash used in financing activities (594) (294)
Change in cash and cash equivalents (3,694) 5,261
Cash and cash equivalents at beginning of period 21,388 16,305
Cash and cash equivalents at end of period 17,694 21,566
Supplemental disclosures of cash flow information    
Cash paid for interest 362 426
Cash paid for income taxes 0 0
Supplemental disclosures of non-cash transactions in investing and financing activities    
Right-of-use assets and liabilities obtained due to lease renewal $ 153 $ 0