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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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