Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets
Accrued bonus	$ 274	$ 238
Accrued bonus	47	50
Stock-based compensation	4,265	4,203
Capitalized R&D expenses	7,825	5,788
Rebate reserve	220	303
Intangible assets, net	181	248
Investment in equity securities	987	628
Net operating loss carryforwards	15,716	13,276
Other	48	6
Total gross deferred tax asset	29,563	24,740
Valuation allowance	(29,516)	(24,646)
Net deferred tax assets	47	94
Deferred tax liabilities
Section 481(a) adjustment - bonus compensation	(47)	(94)
Net deferred tax asset	$ 0	$ 0