Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 19,057us-gaap_Revenues	$ 12,953us-gaap_Revenues	$ 37,473us-gaap_Revenues	$ 27,616us-gaap_Revenues
Cost of revenue	12,678us-gaap_CostOfRevenue	10,055us-gaap_CostOfRevenue	25,915us-gaap_CostOfRevenue	22,327us-gaap_CostOfRevenue
Gross profit	6,379us-gaap_GrossProfit	2,898us-gaap_GrossProfit	11,558us-gaap_GrossProfit	5,289us-gaap_GrossProfit
Operating expense:
Selling, general, and administrative	5,954	4,328	14,581	9,984
Research and development	2,022us-gaap_ResearchAndDevelopmentExpense	2,676us-gaap_ResearchAndDevelopmentExpense	4,196us-gaap_ResearchAndDevelopmentExpense	4,500us-gaap_ResearchAndDevelopmentExpense
Gain from change in estimate on ARO obligation	0	0	(845)	0
Loss on sale of assets	0us-gaap_GainsLossesOnSalesOfAssets	0us-gaap_GainsLossesOnSalesOfAssets	228us-gaap_GainsLossesOnSalesOfAssets	0us-gaap_GainsLossesOnSalesOfAssets
Total operating expense	7,976us-gaap_OperatingExpenses	7,004us-gaap_OperatingExpenses	18,160us-gaap_OperatingExpenses	14,484us-gaap_OperatingExpenses
Operating loss	(1,597)us-gaap_OperatingIncomeLoss	(4,106)us-gaap_OperatingIncomeLoss	(6,602)us-gaap_OperatingIncomeLoss	(9,195)us-gaap_OperatingIncomeLoss
Other income (expense):
Interest income (expense), net	165us-gaap_InterestIncomeExpenseNet	(117)us-gaap_InterestIncomeExpenseNet	35us-gaap_InterestIncomeExpenseNet	(243)us-gaap_InterestIncomeExpenseNet
Foreign exchange (loss) gain	(6)	(90)	51	10
Gain on sale of investment	0us-gaap_GainLossOnInvestments	17us-gaap_GainLossOnInvestments	0us-gaap_GainLossOnInvestments	307us-gaap_GainLossOnInvestments
Change in fair value of financial instruments	86us-gaap_UnrealizedGainLossOnDerivatives	7us-gaap_UnrealizedGainLossOnDerivatives	122us-gaap_UnrealizedGainLossOnDerivatives	(71)us-gaap_UnrealizedGainLossOnDerivatives
Total other income (expense)	245us-gaap_NonoperatingIncomeExpense	(183)us-gaap_NonoperatingIncomeExpense	208us-gaap_NonoperatingIncomeExpense	3us-gaap_NonoperatingIncomeExpense
Loss from continuing operations before income tax expense	(1,352)	(4,289)	(6,394)	(9,192)
Income tax benefit (expense)	396us-gaap_IncomeTaxExpenseBenefit	(433)us-gaap_IncomeTaxExpenseBenefit	2,308us-gaap_IncomeTaxExpenseBenefit	647us-gaap_IncomeTaxExpenseBenefit
Loss from continuing operations	(956)	(4,722)	(4,086)	(8,545)
Income (loss) from discontinued operations, net of tax	4,008	(710)	63,266	1,059
Net income (loss)	3,052us-gaap_NetIncomeLoss	(5,432)us-gaap_NetIncomeLoss	59,180us-gaap_NetIncomeLoss	(7,486)us-gaap_NetIncomeLoss
Other comprehensive income (net of tax):
Foreign exchange translation adjustment	(8)	(43)	(719)	2
Other comprehensive (loss) income	(8)	(43)	(719)	2
Comprehensive income (loss)	$ 3,044us-gaap_ComprehensiveIncomeNetOfTax	$ (5,475)us-gaap_ComprehensiveIncomeNetOfTax	$ 58,461us-gaap_ComprehensiveIncomeNetOfTax	$ (7,484)us-gaap_ComprehensiveIncomeNetOfTax
Net income (loss) per basic and diluted share:
Net income (loss) per basic and diluted shares, continuing operations (USD per share)	$ (0.03)	$ (0.16)	$ (0.13)	$ (0.28)
Net income (loss) per basic and diluted shares, discontinued operations (USD per share)	$ 0.13	$ (0.02)	$ 2.00	$ 0.03
Net income (loss) per basic share and diluted share (USD per share)	$ 0.10us-gaap_EarningsPerShareBasicAndDiluted	$ (0.18)us-gaap_EarningsPerShareBasicAndDiluted	$ 1.87us-gaap_EarningsPerShareBasicAndDiluted	$ (0.25)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average number of basic and diluted shares outstanding	32,077	30,392	31,640	30,162

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 4

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 30

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

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