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Weichai Transactions - Weichai Transaction (Details) - Share Purchase Agreement, Weichai Transaction |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 USD ($) shares | Aug. 31, 2017 shares | Mar. 31, 2017 USD ($) shares | Dec. 31, 2017 shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Consideration received on transaction | $ | $ 60,000,000 |  | $ 60,000,000 |
Common Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 2,728,752 | 2,729,000
Common Stock | Chief Strategy Officer |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares issued in transaction (in shares) |  | 200,000 |  |
Redeemable Convertible Series B Preferred Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares issued in transaction (in shares) | 2,385,624 |  |  |
Debt instrument, convertible, conversion ratio |  |  | 2 |
Issuance of redeemable convertible Series B Preferred Stock, net of fees (in shares) | 4,771,248 |  |  | 4,771,000
Power Solutions International, Inc. | Weichai | Common Stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Percentage of ownership after transaction |  |  | 51.00% |

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