I thought the point of the Volt was to help GM transition to electric drive chain technology; that's how it was going to "save" GM, not through sales. At least,

I thought the point of the Volt was to help GM transition to electric drive chain technology; that's how it was going to "save" GM, not through sales. At least, that's how I remember the then-CEO of GM describing it. How was the Bolt developed? Was it largely an acquisition or in-house development? If in-house were the Volt teams instrumental?