Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 24,353	$ 21,071
Restricted cash	183	165
Short-term investments	20,562us-gaap_ShortTermInvestments	13,567us-gaap_ShortTermInvestments
Accounts receivable, net	8,323us-gaap_AccountsReceivableNetCurrent	3,571us-gaap_AccountsReceivableNetCurrent
Inventories	22,739us-gaap_InventoryNet	34,312us-gaap_InventoryNet
Other inventory supplies	8,208us-gaap_OtherInventorySupplies	12,533us-gaap_OtherInventorySupplies
Prepaid expenses and other current assets	1,035	1,186
Total current assets	85,403us-gaap_AssetsCurrent	86,405us-gaap_AssetsCurrent
Property and equipment, net	107,676us-gaap_PropertyPlantAndEquipmentNet	115,220us-gaap_PropertyPlantAndEquipmentNet
Other assets	1,827us-gaap_OtherAssetsNoncurrent	1,070us-gaap_OtherAssetsNoncurrent
Total assets	194,906us-gaap_Assets	202,695us-gaap_Assets
Liabilities and stockholders' equity
Accounts payable	3,754us-gaap_AccountsPayableCurrent	4,465us-gaap_AccountsPayableCurrent
Accrued payroll	514us-gaap_AccruedSalariesCurrent	369us-gaap_AccruedSalariesCurrent
Accrued and other current liabilities	925us-gaap_OtherLiabilitiesCurrent	867us-gaap_OtherLiabilitiesCurrent
Corporate income and franchise taxes	270us-gaap_AccruedIncomeTaxesCurrent	192us-gaap_AccruedIncomeTaxesCurrent
Accrued real estate taxes	280	336
Advance payments	10rbcn_AdvancePayments	408rbcn_AdvancePayments
Total current liabilities	5,753us-gaap_LiabilitiesCurrent	6,637us-gaap_LiabilitiesCurrent
Deferred tax liability	593	267
Total liabilities	6,346us-gaap_Liabilities	6,904us-gaap_Liabilities
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.001 par value, 5,000,000 undesignated shares authorized, no shares issued or outstanding
Common stock, $0.001 par value, 40,000,000 shares authorized; 27,913,788 and 24,433,523 shares issued; 26,138,944 and 22,658,679 shares outstanding	28us-gaap_CommonStockValue	25us-gaap_CommonStockValue
Additional paid-in capital	372,319us-gaap_AdditionalPaidInCapital	335,935us-gaap_AdditionalPaidInCapital
Treasury stock, at cost, 1,774,844	(12,148)us-gaap_TreasuryStockValue	(12,148)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss	(43)	(418)
Accumulated deficit	(171,596)	(127,603)
Total stockholders' equity	188,560us-gaap_StockholdersEquity	195,791us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 194,906	$ 202,695

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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