Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net loss	$ (43,993)us-gaap_NetIncomeLoss	$ (30,351)us-gaap_NetIncomeLoss	$ (5,538)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	13,637us-gaap_DepreciationAndAmortization	12,660us-gaap_DepreciationAndAmortization	12,027us-gaap_DepreciationAndAmortization
Net loss on disposal of assets	734us-gaap_GainLossOnDispositionOfAssets	550us-gaap_GainLossOnDispositionOfAssets	19us-gaap_GainLossOnDispositionOfAssets
Stock-based compensation	1,130us-gaap_ShareBasedCompensation	1,375us-gaap_ShareBasedCompensation	1,801us-gaap_ShareBasedCompensation
Stock issued to Board of Directors	278rbcn_StockIssuedToBoardOfDirectors	220rbcn_StockIssuedToBoardOfDirectors	162rbcn_StockIssuedToBoardOfDirectors
Realized gain on investments	(258)us-gaap_GainLossOnInvestments		(8)us-gaap_GainLossOnInvestments
Deferred taxes	72us-gaap_DeferredIncomeTaxExpenseBenefit	(5,166)us-gaap_DeferredIncomeTaxExpenseBenefit	(6,324)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock-based compensation		114	(160)
Changes in operating assets and liabilities:
Accounts receivable	(4,752)	9,098	19,975
Inventories	11,312us-gaap_IncreaseDecreaseInInventories	12,979us-gaap_IncreaseDecreaseInInventories	(24,258)us-gaap_IncreaseDecreaseInInventories
Other inventory supplies	4,203	2,976	1,948
Prepaid expenses and other assets	(794)	1,571	1,981
Accounts payable	(637)	(4,472)	(4,004)
Accrued payroll	153	(510)	(581)
Corporate income and franchise taxes	80	(25)	(391)
Accrued real estate taxes	(56)	39	22
Advance payments	(398)	(364)	763
Accrued and other current liabilities	67	(282)	(172)
Net cash (used in) provided by operating activities	(19,222)	412	(2,738)
Cash flows from investing activities
Purchases of property and equipment	(6,842)	(8,721)	(10,975)
Proceeds from disposal of assets	15	141	10
Purchase of investments	(28,805)us-gaap_PaymentsToAcquireInvestments	(2,040)us-gaap_PaymentsToAcquireInvestments	(5,281)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale of investments	22,700	11,390	34,300
Net cash (used in) provided by investing activities	(12,932)	770	18,054
Cash flows from financing activities
Proceeds from exercise of options	256	140	72
Restricted cash	(18)	6	18
Proceeds from public offering, net of issuance costs	34,957
Taxes paid related to net share settlement of equity awards	(55)
Excess tax benefits from stock-based compensation		(114)	160
Net cash provided by financing activities	35,140	32	250
Net effect of currency translation	296	284	(283)
Net increase in cash and cash equivalents	3,282	1,498	15,283
Cash and cash equivalents, beginning of year	21,071	19,573	4,290
Cash and cash equivalents, end of year	24,353	21,071	19,573
Supplemental disclosure of cash flow information
Cash paid for interest	$ 95us-gaap_InterestPaid	$ 87us-gaap_InterestPaid

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- Definition

The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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- Definition

The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

+ References

+ Details

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

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- Definition

The cash inflow associated with the amount received from entity's first offering of stock to the public.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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