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Weichai Transactions - Weichai Collaboration Arrangement (Details) | Mar. 20, 2017
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Equity [Abstract] |
Term of collaborative arrangement | 3 years

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- Definition Collaborative Arrangement, Term + References No definition available. + Details
Name: | psix_CollaborativeArrangementTerm
Namespace Prefix: | psix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration