Stock-based Compensation - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Stock-based Compensation
Total stock-based compensation expense	$ 135	$ 310	$ 715	$ 1,274
Research and development expense
Stock-based Compensation
Total stock-based compensation expense	25	97	234	562
Sales and marketing expense
Stock-based Compensation
Total stock-based compensation expense	28	32	82	104
General and administrative expense
Stock-based Compensation
Total stock-based compensation expense	82	$ 181	399	$ 608
Stock options and RSUs
Stock-based Compensation
Unrecognized stock-based compensation expense	$ 429,000		$ 429,000