XML 87 R70.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income | $ (887,000) | $ 8,643,000 | $ 6,206,000 | $ (72,000) | $ 13,630,000 | $ 11,144,000 | $ 6,133,000 | $ 3,632,000 |  | $ 13,890,000 | $ 34,539,000 | $ (14,001,000) |
Excludable expenses included in pre-tax loss |  |  |  |  |  |  |  |  |  | 9,299,000 | 6,169,000 | 28,031,000 |
Pre-tax income (loss) |  |  |  |  |  |  |  |  |  | $ 4,591,000 | $ 28,370,000 | $ 14,030,000 |
Effective tax rate excluding private placement warrants expenses |  |  |  |  |  |  |  |  |  | (8.50%) | 38.10% | 33.90% |
Federal research tax credit |  |  |  |  |  |  |  |  |  |  |  | $ 641,000 | $ 413,000
Tax credit carry forward expiration period |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Possible decrease in unrecognized tax benefits |  |  |  |  |  |  |  |  | $ 141,000 |  |  |  |

X
- Definition Decrease in unrecognized tax benefits. + References No definition available. + Details
Name: | psix_DecreaseInUnrecognizedTaxBenefits
Namespace Prefix: | psix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Effective income tax rate continuing operations excluding effect of temporary differences. + References No definition available. + Details
Name: | psix_EffectiveIncomeTaxRateContinuingOperationsExcludingEffectOfTemporaryDifferences
Namespace Prefix: | psix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Federal tax credits and other carryforwards. + References No definition available. + Details
Name: | psix_FederalTaxCreditsAndOtherCarryforwards
Namespace Prefix: | psix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Income loss from continuing operations excluded tax deductible expenses. + References No definition available. + Details
Name: | psix_IncomeLossFromContinuingOperationsExcludedTaxDeductibleExpenses
Namespace Prefix: | psix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Income Taxes [Line Items] + References No definition available. + Details
Name: | psix_IncomeTaxesLineItems
Namespace Prefix: | psix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Purchased tax credits carryforwards expiration period. + References No definition available. + Details
Name: | psix_PurchasedTaxCreditsCarryforwardsExpirationPeriod
Namespace Prefix: | psix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax deductible expenses. + References No definition available. + Details
Name: | psix_TaxDeductibleExpenses
Namespace Prefix: | psix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |