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Condensed Consolidated Statements Of Cash Flows - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:        
Net loss $ (26,376,000) $ (19,328,000) $ (50,647,000) $ (36,855,000)
Adjustments to reconcile net loss to net cash used in operating activities:        
Stock-based compensation     1,508,000 980,000
Depreciation 272,000 174,000 544,000 352,000
Amortization of intangible assets 119,000 125,000 238,000 260,000
Changes in operating assets and liabilities:        
Prepaid and other current assets     4,116,000 4,431,000
Operating lease right-of-use assets and liabilities     (17,000) (4,000)
Accounts payable and accrued expenses     6,661,000 (2,368,000)
Accrued development expense     4,764,000 515,000
Accrued compensation and benefits     50,000 (1,701,000)
Other liabilities     (396,000) (254,000)
Net cash used in operating activities     (33,179,000) (34,644,000)
Cash flows from investing activities:        
Purchases of property and equipment     (351,000) (1,891,000)
Net cash used in investing activities     (351,000) (1,891,000)
Cash flows from financing activities:        
Proceeds from issuance of common stock upon exercise of stock options     953,000 330,000
Net cash provided by financing activities     953,000 330,000
Net decrease in cash and cash equivalents     (32,577,000) (36,205,000)
Cash and cash equivalents at beginning of period     201,015,000 233,437,000
Cash and cash equivalents at end of period $ 168,438,000 $ 197,232,000 $ 168,438,000 $ 197,232,000