The Tesla CEO said the company expects to expand their autonomous driver service to include customer-owned cars.

The Austin-based EV company is still working on taking safety drivers out of the passenger seats and expanding into new cities.

Tesla attributed the revenue decline to a drop in vehicle deliveries, less money from regulatory credit sales and a lower average selling price for its vehicles. Still, Musk struck an optimistic tone on Tesla’s post-earnings call and is banking on a rapid expansion of the company’s robotaxi service.