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Weichai Transactions - Series B Redeemable Convertible Preferred Stock (Details) - Share Purchase Agreement, Weichai Transaction - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 30, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Preferred stock, dividend rate, percentage |  | 10.00% |  |
Redeemable Convertible Series B Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Exercise price of warrants or rights (in dollars per share) |  |  |  | $ 16.00
Beneficial conversion feature | $ 23.1 |  |  |
Number of shares issued in transaction (in shares) |  |  | 2,385,624 |
Issuance of redeemable convertible Series B Preferred Stock, net of fees (in shares) |  |  | 4,771,248 | 4,771,000

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