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| **Subsequent Events [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Subsequent Events [Text Block]   | 15. Subsequent EventOn February 28, 2017, we consummated our previously announced strategic alliance with VW T&B, which included an equity investment in the Company by VW T&B pursuant to the Stock Purchase Agreement, the License and Supply Framework Agreement and the Procurement JV Framework Agreement. Pursuant to the VW T&B Stock Purchase Agreement, on February 28, 2017 we issued and VW T&B purchased 16.2 million of our shares for an aggregate purchase price of $256 million at $15.76 per share (an estimated 19.9% stake (16.6% on a pro forma basis) in the Company). |

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| - Definition
The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.
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