Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net (loss) income	$ (1,456)us-gaap_NetIncomeLoss	$ 2,374us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
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Amortization	850us-gaap_AdjustmentForAmortization	10us-gaap_AdjustmentForAmortization
Non-cash interest expense	25psix_NoncashInterestExpense	14psix_NoncashInterestExpense
Share-based compensation expense	305	321
Increase (decrease) in accounts receivable allowances	163	(8)
Increase in inventory reserves	225psix_IncreaseDecreaseInInventoryReserve	183psix_IncreaseDecreaseInInventoryReserve
Increase (decrease) in valuation of private placement warrant liability	3,614	(233)
Loss on investment in joint venture	47	33
Loss on disposal of assets	18us-gaap_GainLossOnDispositionOfAssets
(Increase) decrease in operating assets, net of effects of business acquisition:
Accounts receivable	6,251	(6,170)
Inventories	(18,059)us-gaap_IncreaseDecreaseInInventories	(12,945)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	672	580
Increase (decrease) in operating liabilities, net of effects of business acquisition:
Accounts payable	(4,820)	7,220
Accrued compensation and benefits and other accrued liabilities	568	(2,530)
Income taxes payable	812	418
Other noncurrent liabilities	221	(367)
Net cash used in operating activities	(9,731)	(10,622)
Cash flows from investing activities
Purchases of property, plant and equipment	(806)	(784)
Acquisitions	(9,735)
Net cash used in investing activities	(10,541)	(784)
Cash flows from financing activities
Advances from revolving line of credit - noncurrent obligation	32,363us-gaap_ProceedsFromLinesOfCredit	14,126us-gaap_ProceedsFromLinesOfCredit
Repayments of revolving line of credit - noncurrent obligation	(8,000)us-gaap_RepaymentsOfLinesOfCredit	(5,900)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from exercise of private placement warrants		523
Payments on long-term debt	(417)us-gaap_ProceedsFromRepaymentsOfDebt
Net cash provided by financing activities	23,946	8,749
Increase (decrease) in cash	3,674	(2,657)
Cash at beginning of period	6,561us-gaap_Cash	6,306us-gaap_Cash
Cash at end of period	10,235us-gaap_Cash	3,649us-gaap_Cash
Supplemental disclosures of cash flow information
Cash paid for interest	435us-gaap_InterestPaid	86us-gaap_InterestPaid
Cash paid for income taxes	608us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash transactions
Unpaid property, plant, equipment and other assets	1,001	854
Fair value of private placement warrants exercised		$ 2,226

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