Cray (CRAY) 10-K 13 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 10, 2014	Jun. 30, 2013
Document and Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Period Focus	'FY	'	'
Document Fiscal Year Focus	'2013	'	'
Entity Registrant Name	'CRAY INC	'	'
Entity Central Index Key	'0000949158	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	40,426,441	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Public Float	'	'	$741,672,155

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$192,633	$253,065
Short-term investments	14,048	52,563
Accounts and other receivables, net	182,527	13,440
Inventory	95,129	89,796
Prepaid expenses and other current assets	20,999	11,823
Total current assets	505,336	420,687
Noncurrent Assets:	'	'
Long-term restricted cash	13,768	0
Long-term investments	0	17,577
Property and equipment, net	30,278	25,543
Service inventory, net	1,828	1,490
Goodwill	14,182	14,182
Purchased intangible assets, net	6,362	7,981
Deferred tax asset	19,206	10,041
Other non-current assets	12,406	12,813
TOTAL ASSETS	603,366	510,314
Current liabilities:	'	'
Accounts payable	34,225	34,732
Accrued payroll and related expenses	22,470	25,927
Other accrued liabilities	22,225	8,616
Deferred revenue	91,488	68,060
Total current liabilities	170,408	137,335
Noncurrent Liabilities:	'	'
Long-term deferred revenue	50,477	29,254
Other non-current liabilities	6,894	3,179
TOTAL LIABILITIES	227,779	169,768
Shareholders’ equity:	'	'
Preferred stock — Authorized and undesignated, 5,000,000 shares; no shares issued or outstanding	0	0
Common stock and additional paid-in capital, par value $.01 per share — Authorized, 75,000,000 shares; issued and outstanding 39,435,215 and 36,763,379 shares, respectively	586,243	577,938
Accumulated other comprehensive income	853	5,181
Accumulated deficit	-211,509	-242,573
TOTAL SHAREHOLDERS’ EQUITY	375,587	340,546
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$603,366	$510,314

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]	'	'
Preferred stock, shares Authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock and additional paid-in capital, par value	$0.01	$0.01
Common stock and additional paid-in capital, shares authorized	75,000,000	75,000,000
Common stock and additional paid-in capital, shares issued	40,469,854	39,435,215
Common stock and additional paid-in capital, shares outstanding	40,469,854	39,435,215

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue:	'	'	'
Product	$436,330	$353,767	$155,561
Service	89,419	67,291	80,485
Total revenue	525,749	421,058	236,046
Cost of revenue:	'	'	'
Cost of product revenue	298,244	231,237	101,000
Cost of service revenue	43,179	38,643	40,680
Total cost of revenue	341,423	269,880	141,680
Gross profit	184,326	151,178	94,366
Operating expenses:	'	'	'
Research and development, net	87,728	64,303	49,452
Sales and marketing	51,345	37,180	26,134
General and administrative	23,603	20,707	15,840
Restructuring	0	0	1,783
Total operating expenses	162,676	122,190	93,209
Net gain on sale of interconnect hardware development program	0	139,068	0
Income from operations	21,650	168,056	1,157
Other income (expense), net	-1,378	472	-989
Interest income (expense), net	757	204	-33
Income before income taxes	21,029	168,732	135
Income tax benefit (expense)	11,194	-7,491	14,194
Net income	$32,223	$161,241	$14,329
Basic net income per common share (EPS)	$0.85	$4.42	$0.41
Diluted net income per common share (EPS)	$0.81	$4.27	$0.40
Basic weighted average shares outstanding (Shares Outstanding)	37,832	36,509	35,122
Diluted weighted average shares outstanding (Shares Outstanding)	39,776	37,789	36,072

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Other Comprehensive Income [Abstract]	'	'	'
Net income	$32,223	$161,241	$14,329
Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'
Unrealized loss on available-for-sale investments	46	-46	0
Foreign currency translation adjustments	-1,044	-43	785
Unrealized gain (loss) on cash flow hedges	-4,292	-824	1,055
Reclassification adjustments on cash flow hedges included in net income	962	-386	-266
Other comprehensive income (loss)	-4,328	-1,299	1,574
Comprehensive income	$27,895	$159,942	$15,903

Consolidated_Statements_of_Sha

Consolidated Statements of Shareholders’ Equity (USD $)	Total	Common Stock and Additional Paid In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2010	$145,821	$559,058	$4,906	($418,143)
Balance, shares at Dec. 31, 2010	'	36,068,000	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Issuance of shares under employee stock purchase plan, shares	'	65,000	'	'
Issuance of shares under employee stock purchase plan	372	372	'	'
Exercise of stock options, shares	248,271	248,000	'	'
Exercise of stock options	1,090	1,090	'	'
Restricted shares issued for compensation, net of forfeitures, shares	'	382,000	'	'
Restricted shares issued for compensation, net of forfeitures and taxes	0	'	'	'
Share-based compensation	3,628	3,628	'	'
Other comprehensive loss	1,574	'	1,574	'
Net income	14,329	'	'	14,329
Balance at Dec. 31, 2011	166,814	564,148	6,480	-403,814
Balance, shares at Dec. 31, 2011	'	36,763,000	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Issuance of shares under employee stock purchase plan, shares	'	38,000	'	'
Issuance of shares under employee stock purchase plan	397	397	'	'
Exercise of stock options, shares	1,346,326	1,346,000	'	'
Exercise of stock options	7,430	7,430	'	'
Restricted shares issued for compensation, net of forfeitures, shares	'	1,288,000	'	'
Restricted shares issued for compensation, net of forfeitures and taxes	0	'	'	'
Share-based compensation	5,963	5,963	'	'
Other comprehensive loss	-1,299	'	-1,299	'
Net income	161,241	'	'	161,241
Balance at Dec. 31, 2012	340,546	577,938	5,181	-242,573
Balance, shares at Dec. 31, 2012	39,435,215	39,435,000	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'
Issuance of shares under employee stock purchase plan, shares	'	25,000	'	'
Issuance of shares under employee stock purchase plan	517	517	'	'
Exercise of stock options, shares	495,221	495,000	'	'
Exercise of stock options	3,161	3,161	'	'
Restricted shares issued for compensation, net of forfeitures, shares	'	515,000	'	'
Restricted shares issued for compensation, net of forfeitures and taxes	-3,771	-2,612	'	-1,159
Share-based compensation	7,239	7,239	'	'
Other comprehensive loss	-4,328	'	-4,328	'
Net income	32,223	'	'	32,223
Balance at Dec. 31, 2013	$375,587	$586,243	$853	($211,509)
Balance, shares at Dec. 31, 2013	40,469,854	40,470,000	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating activities:	'	'	'
Net income	$32,223	$161,241	$14,329
Adjustments to reconcile net income to net cash provided by (used in) operating activities:	'	'	'
Depreciation and amortization	14,242	8,652	8,601
Accretion and amortization on available for sale investments	1,977	0	0
Loss on disposal of fixed assets	42	128	503
Net gain on sale of interconnect hardware development program	0	-139,068	0
Share-based compensation expense	7,239	5,963	3,628
Inventory write-down	917	2,329	0
Deferred income taxes	-13,175	3,020	-14,396
Cash (used in) provided by operations due to changes in operating assets and liabilities:	'	'	'
Accounts and other receivables	-169,753	60,744	34,180
Inventory	-10,780	7,004	-50,950
Prepaid expenses and other assets	-2,670	1,763	-2,275
Accounts payable	-509	-6,489	18,099
Accrued payroll and related expenses and other accrued liabilities	4,721	15,202	-9,493
Other non-current liabilities	3,701	492	-71
Deferred revenue	44,475	35,911	-5,978
Net cash (used in) provided by operating activities	-87,350	156,892	-3,823
Investing activities:	'	'	'
Sales/maturities of short-term investments	139,277	0	0
Purchases of available-for-sale investments	-85,162	-70,218	0
Decrease in restricted cash	-13,768	3,776	137
Proceeds from the sale of interconnect hardware development program, net	0	139,225	0
Cash used in acquisition, net of cash acquired	0	-24,246	0
Purchases of property and equipment	-13,136	-10,843	-4,916
Net cash provided by (used in) investing activities	27,211	37,694	-4,779
Financing activities:	'	'	'
Proceeds from issuance of common stock through employee stock purchase plan	517	397	372
Restricted shares issued for compensation, net of forfeitures and taxes	-3,771	0	0
Proceeds from exercise of options	3,161	7,430	1,090
Net cash provided by financing activities	-93	7,827	1,462
Effect of foreign exchange rate changes on cash and cash equivalents	-200	241	170
Net increase (decrease) in cash and cash equivalents	-60,432	202,654	-6,970
Cash and cash equivalents:	'	'	'
Beginning of period	253,065	50,411	57,381
End of period	192,633	253,065	50,411
Supplemental disclosure of cash flow information:	'	'	'
Cash paid for interest	3	90	98
Cash paid for income taxes	2,611	2,804	1,495
Non-cash investing and financing activities:	'	'	'
Inventory transfers to fixed assets and service inventory	$4,530	$6,278	$2,310

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Accounting Principles
	The consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP.
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated.
	Reclassifications
	Certain prior year amounts have been reclassified to conform with the current year presentation. There has been no impact on previously reported net income or shareholders’ equity from such reclassifications.
	Use of Estimates
	The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Company’s consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates.
	Cash, Cash Equivalents and Restricted Cash
	Cash and cash equivalents consist of highly liquid financial instruments that are readily convertible to cash and have maturities of three months or less at the time of acquisition. The Company maintains cash and cash equivalent balances with financial institutions that exceed federally insured limits. As of December 31, 2013, the Company had $13.8 million in long-term restricted cash associated with certain letters of credit outstanding to secure customer prepayments. The Company had no restricted cash balances as of December 31, 2012.
	Investments
	The Company's investments consist primarily of commercial paper, corporate debt, and other debt securities. Debt securities are classified as available-for-sale and are reported at fair value with unrealized gains and losses, net of applicable taxes, recorded in accumulated other comprehensive income, a component of shareholders' equity. The realized gains and losses for available-for-sale securities are included in other income and expense in the Consolidated Statements of Operations. Realized gains and losses are calculated based on the specific identification method.
	The Company monitors its investment portfolio for impairment on a periodic basis. When the carrying value of an investment in debt securities exceeds its fair value and the decline in value is determined to be an other-than-temporary decline, and when the Company does not intend to sell the debt security and it is not more likely than not that the Company will be required to sell the debt securities prior to recovery of its amortized cost basis, the Company records an impairment charge in the amount of the credit loss and the balance, if any, to other comprehensive income (loss).
	Investments that mature between three months and one year from the purchase date are initially classified as short-term investments in the Consolidated Balance Sheet. Investments that mature beyond one year from the purchase date are initially classified as long-term investments in the Consolidated Balance Sheet.
	Foreign Currency Derivatives
	The Company uses forward foreign currency exchange contracts to hedge certain foreign currency exposures. Forward contracts are cash flow hedges of the Company’s foreign currency exposures on certain revenue contracts and are recorded at the contract’s fair value. Any gains or losses on the effective portion of the forward contract is initially reported in “Accumulated other comprehensive income,” a component of shareholders’ equity, with a corresponding asset or liability recorded based on the fair value of the forward contract. When the hedged transaction is settled, any unrecognized gains or losses on the hedged transaction are reclassified into results of operations in the same period. Any hedge ineffectiveness is recorded to operations in the current period. The Company measures hedge effectiveness by comparing changes in fair values of the forward contract and expected cash flows based on changes in the spot prices of the underlying currencies. Cash flows from forward contracts accounted for as cash flow hedges are classified in the same category as the cash flows from the items being hedged. The Company does not use derivative financial instruments for speculative purposes.
	Concentration of Credit Risk
	Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents, available-for-sale investments, accounts receivable, long-term restricted cash and forward foreign currency exchange contracts.
	The Company maintains cash and cash equivalents, available-for-sale securities and forward contracts with various financial institutions. As part of its risk management process, the Company performs periodic evaluations of the relative credit standing of the financial institutions. The Company has not sustained any credit losses from instruments held at financial institutions. The Company utilizes forward contracts to protect against the effects of foreign currency fluctuations. Such contracts involve the risk of non-performance by the counterparty, which could result in a material loss.
	The Company currently derives a significant portion of its revenue from sales of products and services to different agencies of the U.S. government or commercial customers primarily serving various agencies of the U.S. government. See Note 18 — Segment Information for additional information. Given the type of customers, the Company does not believe its accounts receivable represent significant credit risk.
	Other Concentration
	The Company obtains certain components from single source suppliers due to technology, availability, price, quality or other considerations. The loss of a single source supplier, the single source supplier’s inability to deliver the required components or intellectual property due to natural disaster or other reasons, the deterioration of the relationship with a single source supplier, or any unilateral modification of contract terms under which the Company is supplied components by a single source supplier could have a significant adverse effect on the Company’s revenue and gross margins.
	Accounts Receivable
	Accounts receivable are stated at principal amounts and are primarily comprised of amounts contractually due from customers for products and services and amounts due from government research and development contracts. The Company provides an allowance for doubtful accounts based on an evaluation of customer past due account balances. In determining whether to record an allowance for a specific customer, the Company considers a number of factors, including prior payment history and financial information for the customer.
	Fair Values of Financial Instruments
	The Company measures certain financial assets and liabilities at fair value based on the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. The Company’s financial instruments primarily consist of debt securities, time deposits, money market funds, and foreign currency derivatives. See Note 5 for a further discussion on fair value of financial instruments.
	Inventories
	Inventories are valued at the lower of cost or market, with cost computed on a first-in, first-out basis. The Company regularly evaluates the technological usefulness and anticipated future demand for various inventory components and the expected use of the inventory. When the Company determines it is not likely the cost of inventory items will be recovered through future sales, the Company writes-down the related inventory to its estimated market value.
	In connection with certain of its sales agreements, the Company may receive used equipment from a customer. This inventory generally will be recorded at no value based on the expectation that the Company will not be able to resell or otherwise use the equipment. In the event that the Company has a specific contractual plan for resale at the date the inventory is acquired, the inventory is recorded at its estimated fair value.
	Property and Equipment and Intangible Assets, net
	Property and equipment are recorded at cost less accumulated depreciation and amortization. Additions and improvements are capitalized and maintenance and repairs are expensed as incurred. Depreciation is calculated on a straight-line basis over the estimated useful lives of the related assets, ranging from 18 months to seven years for furniture and fixtures, three years for computer equipment, and eight years to 25 years for buildings and land improvements. Leasehold improvements are depreciated over the life of the lease or asset, whichever is shorter.
	The Company amortizes purchased intangible assets with finite lives using the straight-line method over the estimated economic lives of the assets, ranging from two to ten years.
	Service Inventory
	Service inventory is valued at the lower of cost or market and represents inventory used to support service and maintenance agreements with customers. As inventory is utilized, replaced items are returned to us and are either repaired or scrapped. Costs incurred to repair inventory to a usable state are charged to expense as incurred. Service inventory is recorded at cost and is amortized over the estimated service life of the related product platform (generally four years).
	Impairment of Long-Lived Assets and Intangibles
	The Company evaluates property, plant and equipment and intangible assets with finite lives for impairment whenever events or changes in circumstances indicate the carrying value of an asset may not be recoverable. The Company assesses the recoverability of the assets based on the undiscounted future cash flow the assets are expected to generate and recognizes an impairment loss when estimated undiscounted future cash flow expected to result from the use of the asset plus net proceeds expected from disposition of the asset, if any, are less than the carrying value of the asset. When the Company identifies an impairment, the carrying value of the asset is reduced to its estimated fair value based on a discounted cash flow approach or, when available and appropriate, to comparable market values.
	Goodwill
	Goodwill is not amortized but is tested for impairment at least annually. The Company reviews goodwill for impairment annually at the beginning of its fourth fiscal quarter and whenever events or changes in circumstances indicate the carrying value of the asset may not be recoverable. The goodwill impairment test consists of a two-step process, if necessary. However, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in ASC Topic 350. The more likely than not threshold is defined as having a likelihood of more than 50 percent. If, after assessing the totality of events or circumstances, the Company determines that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary and goodwill is considered to be unimpaired. However, if based on the qualitative assessment the Company concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, the Company will proceed with performing the two-step process.
	In step one, the Company determines the fair value of each reporting unit and compares it to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, goodwill is not impaired and no further testing is performed. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, the Company records an impairment loss equal to the difference.
	The Company performed its qualitative assessment during the fourth fiscal quarter of 2013 and concluded that it was more likely than not that the fair values of its reporting units were greater than their carrying amounts. After reaching this conclusion, the two-step impairment test was unnecessary and no further testing was performed. The qualitative factors that were considered included, but were not limited to, general economic conditions, outlook for the HPC and big data markets, recent and forecasted financial performance and the price of the Company's common stock.
	Business Combinations
	The Company accounts for business combinations using the acquisition method of accounting and allocates the purchase price to the tangible and intangible assets acquired and the liabilities assumed based upon their estimated fair values at the acquisition date. The difference between the purchase price and the fair value of the net assets acquired is recorded as goodwill. The Company uses estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date. During the measurement period, which may be up to one year from the acquisition date, any refinements made to the fair value of the assets and liabilities assumed are recorded with retrospective effect.
	The fair values of intangible assets acquired are estimated using a discounted cash flow approach with Level 3 inputs. Under this method, an intangible asset’s fair value is equal to the present value of the incremental after-tax cash flows (excess earnings) attributable solely to the intangible asset over its remaining useful life. To calculate fair value, the Company uses risk-adjusted cash flows discounted at rates considered appropriate given the inherent risks associated with each type of asset. The Company believes the level and timing of cash flows appropriately reflects market participant assumptions.
	Revenue Recognition
	The Company recognizes revenue when it is realized or realizable and earned. The Company considers revenue realized or realizable and earned when it has persuasive evidence of an arrangement, delivery has occurred, the sales price is fixed or determinable, and collectibility is reasonably assured. Delivery does not occur until the products have been shipped or services provided to the customer, risk of loss has transferred to the customer, and, where applicable, a customer acceptance has been obtained. The sales price is not considered to be fixed or determinable until all material contingencies related to the sales have been resolved. The Company records revenue in the Consolidated Statements of Operations net of any sales, use, value added or certain excise taxes imposed by governmental authorities on specific sales transactions. In addition to the aforementioned general policy, the following are the Company's statements of policy with regard to multiple-element arrangements and specific revenue recognition policies for each major category of revenue.
	Multiple-Element Arrangements. The Company commonly enters into revenue arrangements that include multiple deliverables of its product and service offerings due to the needs of its customers. Products may be delivered in phases over time periods which can be as long as five years. Maintenance services generally begin upon acceptance of the first equipment delivery and future deliveries of equipment generally have an associated maintenance period. The Company considers the maintenance period to commence upon acceptance of the product or installation in situations where a formal acceptance is not required, which may include a warranty period and accordingly allocates a portion of the arrangement consideration as a separate deliverable which is recognized as service revenue over the entire service period. Other services such as training and engineering services can be delivered as a discrete delivery or over the term of the contract. A multiple-element arrangement is separated into more than one unit of accounting if the following criteria are met:
	•	The delivered item(s) has value to the customer on a standalone basis; and
	•	If the arrangement includes a general right of return relative to the delivered item(s), delivery or performance of the undelivered item(s) is considered probable and substantially in the control of the Company.
	If these criteria are met for each element, the arrangement consideration is allocated to the separate units of accounting based on each unit's relative selling price. If these criteria are not met, the arrangement is accounted for as one unit of accounting which would result in revenue being recognized ratably over the contract term or being deferred until the earlier of when such criteria are met or when the last undelivered element is delivered.
	The Company follows a selling price hierarchy in determining the best estimate of the selling price of each deliverable. Certain products and services are sold separately in standalone arrangements for which the Company is sometimes able to determine vendor specific objective evidence, or VSOE. The Company determines VSOE based on normal pricing and discounting practices for the product or service when sold separately.
	When the Company is not able to establish VSOE for all deliverables in an arrangement with multiple elements, the Company attempts to establish the selling price of each remaining element based on third-party evidence, or TPE. The Company's inability to establish VSOE is often due to a relatively small sample of customer contracts that differ in system size and contract terms which can be due to infrequently selling each element separately, not pricing products within a narrow range, or only having a limited sales history, such as in the case of certain advanced and emerging technologies. TPE is determined based on the Company's prices or competitor prices for similar deliverables when sold separately. However, the Company is often unable to determine TPE, as the Company's offerings contain a significant level of customization and differentiation from those of competitors and the Company is often unable to reliably determine what similar competitor products' selling prices are on a standalone basis.
	When the Company is unable to establish selling price using VSOE or TPE, the Company uses estimated selling price, or ESP, in its allocation of arrangement consideration. The objective of ESP is to determine the price at which the Company would transact a sale if the product or service were sold on a standalone basis. In determining ESP, the Company uses the cost to provide the product or service plus a margin, or consider other factors. When using cost plus a margin, the Company considers the total cost of the product or service, including customer-specific and geographic factors. The Company also considers the historical margins of the product or service on previous contracts and several factors including any changes to pricing methodologies, competitiveness of products and services and cost drivers that would cause future margins to differ from historical margins.
	Products. The Company most often recognizes revenue from sales of products upon customer acceptance of the system. Where formal acceptance is not required, the Company recognizes revenue upon delivery or installation. When the product is part of a multiple element arrangement, the Company allocates a portion of the arrangement consideration to product revenue based on estimates of selling price.
	Services. Maintenance services are provided under separate maintenance contracts with customers. These contracts generally provide for maintenance services for one year, although some are for multi-year periods, often with prepayments for the term of the contract. The Company considers the maintenance period to commence upon acceptance of the product or installation in situations where a formal acceptance is not required, which may include a warranty period. When service is part of a multiple element arrangement, the Company allocates a portion of the arrangement consideration to maintenance service revenue based on estimates of selling price. Maintenance contracts that are billed in advance of revenue recognition are recorded as deferred revenue. Maintenance revenue is recognized ratably over the term of the maintenance contract.
	Revenue from engineering services is recognized as services are performed.
	Project Revenue. Revenue from design and build contracts is recognized under the percentage-of-completion (or POC method). Under the POC method, revenue is recognized based on the costs incurred to date as a percentage of the total estimated costs to fulfill the contract. If circumstances arise that change the original estimates of revenues, costs, or extent of progress toward completion, revisions to the estimates are made. These revisions may result in increases or decreases in estimated revenues or costs, and such revisions are recorded in income in the period in which the circumstances that gave rise to the revision become known by management. The Company performs ongoing profitability analyses of its contracts accounted for under the POC method in order to determine whether the latest estimates of revenue, costs and extent of progress require updating. If at any time these estimates indicate that the contract will be unprofitable, the entire estimated loss for the remainder of the contract is recorded immediately.
	The Company records revenue from certain research and development contracts which include milestones using the milestone method if the milestones are determined to be substantive. A milestone is considered to be substantive if management believes there is substantive uncertainty that it will be achieved and the milestone consideration meets all of the following criteria:
	•	It is commensurate with either of the following:
	•	The Company's performance to achieve the milestone; or
	•	The enhancement of value of the delivered item or items as a result of a specific outcome resulting from the Company's performance to achieve the milestone.
	•	It relates solely to past performance.
	•	It is reasonable relative to all of the deliverables and payment terms (including other potential milestone consideration) within the arrangement.
The individual milestones are determined to be substantive or non-substantive in their entirety and milestone consideration is not bifurcated.
Revenue from projects is classified as Product Revenue or Service Revenue, based on the nature of the work performed.
Nonmonetary Transactions. The Company values and records nonmonetary transactions at the fair value of the asset surrendered unless the fair value of the asset received is more clearly evident, in which case the fair value of the asset received is used.
Foreign Currency Translation
The Company uses the U.S. dollar predominantly as its functional currency. Assets and liabilities of foreign subsidiaries that have a functional currency denominated in non-U.S. dollars are translated into U.S. dollars at year-end exchange rates, and revenue and expenses of these foreign subsidiaries are translated at average rates prevailing during the year. Translation adjustments are included in “Accumulated other comprehensive income,” a separate component of shareholders’ equity. Transaction gains and losses arising from transactions denominated in a currency other than the functional currency of the entity involved are included in “Other (income) expense, net” in the accompanying Consolidated Statements of Operations. Net transaction losses were $1.3 million, $0.1 million, and $1.3 million for 2013, 2012, and 2011, respectively.
Research and Development
Research and development expenses include costs incurred in the development and production of hardware and software, costs incurred to enhance and support existing product features, costs incurred to support and improve development processes, and costs related to future product development. Research and development costs are expensed as incurred, and may be offset by co-funding from third parties. The Company may also enter into arrangements whereby it makes advance, non-refundable payments to a vendor to perform certain research and development services. These payments are deferred and recognized over the vendor’s estimated performance period. During the third quarter of 2009, the Company amended a vendor agreement to settle outstanding performance issues. The Company had made advance payments of $16.2 million to the vendor. Due to the amendment, the Company received a refund of $10.0 million of amounts previously paid to the vendor and the right to receive rebates on future purchases. The Company estimated the fair value of this rebate right to be $6.2 million. The Company believes the rebate right is recoverable and it has been classified in “Other non-current assets” in the Consolidated Balance Sheets. No gain or loss was recorded as a result of this amendment. As of December 31, 2013, $2.8 million in rebates remain available for use.
Amounts to be received under co-funding arrangements with the U.S. government or other customers are based on either contractual milestones or costs incurred. These co-funding milestone payments are recognized in operations as performance is estimated to be completed and are measured as milestone achievements occur or as costs are incurred. These estimates are reviewed on a periodic basis and are subject to change, including in the near term. If an estimate is changed, net research and development expense could be impacted significantly.
The Company does not record a receivable from the U.S. government prior to completing the requirements necessary to bill for a milestone or cost reimbursement. Funding from the U.S. government is subject to certain budget restrictions and milestones may be subject to completion risk, and as a result, there may be periods in which research and development costs are expensed as incurred for which no reimbursement is recorded, as milestones have not been completed or the U.S. government has not funded an agreement. Accordingly, there can be substantial variability in the amount of net research and development expenses from quarter to quarter and year to year.
The Company classifies amounts to be received from funded research and development projects as either revenue or a reduction to research and development expense based on the specific facts and circumstances of the contractual arrangement, considering total costs expected to be incurred compared to total expected funding and the nature of the research and development contractual arrangement. In the event that a particular arrangement is determined to represent revenue, the corresponding research and development costs are classified as cost of revenue.
Income Taxes
Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and operating loss and tax credit carryforwards and are measured using the enacted tax rates and laws that will be in effect when the differences and carryforwards are expected to be recovered or settled. A valuation allowance for deferred tax assets is provided when the Company estimates that it is more likely than not that all or a portion of the deferred tax assets may not be realized through future operations. This assessment is based upon consideration of available positive and negative evidence, which includes, among other things, recent results of operations and expected future profitability. The Company considers its actual historical results over several years to have stronger weight than other more subjective indicators, including forecasts, when considering whether to establish or reduce a valuation allowance on deferred tax assets.
The Company recognizes the income tax benefit from a tax position only if it is more likely than not that the tax position will be sustained on examination by the applicable taxing authorities, based on the technical merits of the Company’s position. The tax benefit recognized in the financial statements from such a position is measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement.
Estimated interest and penalties are recorded as a component of interest expense and other expense, respectively.
As of December 31, 2013, the Company had approximately $106.2 million of net deferred tax assets, against which the Company provided a $77.8 million valuation allowance, resulting in a net deferred tax asset of $28.4 million. During the year ended December 31, 2013 the Company reduced the valuation allowance held against its deferred tax assets by $13.5 million due to actual income from operations during the year ended December 31, 2013 exceeding amounts previously used in the evaluation of the realizability of the Company's deferred tax assets at the beginning of the year and based upon an assessment of all positive and negative evidence relating to future years. The Company considers its actual historical results over several years to have stronger weight than other more subjective indicators when considering whether to establish or reduce a valuation allowance on deferred tax assets. The Company continues to provide a partial valuation allowance against its U.S. deferred tax assets and a full valuation allowance against deferred tax assets arising in a limited number of foreign jurisdictions as the realization of such assets is not considered to be more likely than not at this time. In a future period the Company’s assessment of the realizability of its deferred tax assets and therefore the appropriateness of the valuation allowance could change based on an assessment of all available evidence, both positive and negative in that future period. If the Company’s conclusion about the realizability of its deferred tax assets and therefore the appropriateness of the valuation allowance changes in a future period, the Company could record a substantial tax provision or benefit in its Consolidated Statement of Operations when that occurs.
Share-Based Compensation
The Company measures compensation cost for share-based payment awards at fair value and recognizes it as compensation expense over the service period for awards expected to vest. Share-based compensation expense is recognized for all share-based payment awards, net of an estimated forfeiture rate. Compensation cost is only recognized for those shares expected to vest on a straight-line basis over the requisite service period of the award.
Determining the appropriate fair value model and calculating the fair value of share-based payment awards requires subjective assumptions, including the expected life of the share-based payment awards and stock price volatility. The Company utilizes the Black-Scholes options pricing model to value the stock options granted under its options plans. In this model, the assumptions utilized relate to stock price volatility, stock option term and forfeiture rates that are based upon both historical factors as well as management’s judgment.
The fair value of restricted stock and restricted stock units is determined based on the number of shares or units granted and the quoted price of the Company's common stock at the date of grant.
The Company grants performance vesting restricted shares to executives as one of the ways to align compensation with shareholder interests. Vesting of these awards is contingent upon achievement of certain performance conditions. Compensation expense for these awards is only recorded when vesting is deemed to be probable.
Shipping and Handling Costs
Costs related to shipping and handling are included in “Cost of product revenue” and “Cost of service revenue” in the accompanying Consolidated Statements of Operations.
Advertising Costs
Sales and marketing expenses in the accompanying Consolidated Statements of Operations include advertising expenses of $2.2 million, $1.2 million, and $0.6 million in 2013, 2012, and 2011, respectively. The Company incurs advertising costs for representation at certain trade shows, promotional events and sales lead generation, as well as design and printing costs for promotional materials. The Company expenses all advertising costs as incurred.
Earnings Per Share, or EPS
Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares, excluding unvested restricted stock outstanding during the period. Diluted EPS is computed by dividing net income available to common shareholders by the weighted average number of common and potential common shares outstanding during the period, which includes the additional dilution related to conversion of stock options, unvested restricted stock and restricted stock units as computed under the treasury stock method. For the years ended December 31, 2013, 2012 and 2011, the added shares from these items included in the calculation of diluted shares and EPS totaled approximately 1.9 million, 1.3 million, and 0.9 million, respectively. Potentially dilutive shares of 0.5 million, 0.4 million, and 2.2 million, respectively, have been excluded from the denominator in the computation of diluted EPS for the years ended December 31, 2013, 2012 and 2011, respectively, because they are antidilutive.
Accumulated Other Comprehensive Income
Accumulated other comprehensive income, a component of Shareholders’ equity, consisted of the following at December 31 (in thousands):
		2013			2012			2011
Accumulated unrealized net loss on available-for-sale investments		$	—		$	(46	)	$	—
Accumulated currency translation adjustments		3,257			4,301			4,344
Accumulated unrealized net gain (loss) on cash flow hedges		(2,404		)	926			2,136
Accumulated other comprehensive income		$	853		$	5,181		$	6,480
Recent Accounting Pronouncements
In February 2013, the Financial Accounting Standards Board issued ASU No. 2013-02, Comprehensive Income, or ASU 2013-02. The guidance in ASU 2013-02 requires entities to disclose additional information about reclassification adjustments and significant items reclassified out of accumulated other comprehensive income by component and by respective line items of net income (loss). ASU 2013-02 is effective for fiscal years beginning after December 15, 2012. The Company adopted this guidance on January 1, 2013 and has included all disclosure required by ASU 2013-02.

Description_of_Business

Description of Business	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Description of Business	'
	DESCRIPTION OF BUSINESS
	Cray Inc., or Cray, or the Company, designs, develops, manufactures, markets and services the high-end of the high-performance computing, or HPC, market, primarily categories of systems commonly known as supercomputers, and provides storage and analytics solutions, software, system maintenance and support services and engineering services related to supercomputer systems. Cray’s supercomputer systems address challenging scientific, engineering, commercial and national security computing problems. The Company’s customers include government agencies, government-funded entities, academic institutions and commercial entities.

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Acquisition	'
	ACQUISITION
	On November 21, 2012, the Closing Date, the Company acquired all the outstanding shares of Appro International, Inc., or Appro, for cash consideration of $24.9 million. Appro is a provider of cluster solutions in the high performance computing market. The acquisition of Appro allowed the Company to expand its product offering in the high performance computing market. The Company reports the financial results of the Appro business in the HPC Systems segment.
	The Company utilized a third-party appraisal in its determination of the fair value of the various assets acquired and liabilities assumed. The fair value of the acquired assets, net of assumed liabilities, equals the $24.9 million cash consideration paid by the Company. No measurement period adjustments were required.
	The following are the estimated fair values of the assets acquired and liabilities assumed (in thousands):
	Cash	$	635
	Inventories	7,526
	Other tangible assets	5,702
	Deferred revenue	(2,400		)
	Accounts payable	(2,918		)
	Deferred tax liabilities	(3,685		)
	Other liabilities assumed	(2,061		)
	Net tangible assets	2,799
	Trademarks	300
	Developed technology	5,400
	Customer relationships	1,800
	Non-compete agreements	400
	Goodwill	14,182
	Total net assets acquired	$	24,881
	The fair values of the major components of the intangible assets acquired and their estimated useful lives are as follows (in thousands):
							Useful Life
	Intangible Asset Class		Fair Value				(in Years)
	Trademarks		$	300			5
	Developed technology		$	5,400			3
	Customer relationships		$	1,800			10
	Non-compete agreements		$	400			2
	The revenue and net loss of Appro from the Closing Date to December 31, 2012 included in the accompanying consolidated statements of operations were $0.6 million and $1.3 million , respectively.
	The Company incurred acquisition-related costs (i.e., legal, accounting, valuation, and other costs) of $0.9 million during the year ended December 31, 2012. The acquisition-related costs were expensed in the accompanying Consolidated Statements of Operations for the year ended December 31, 2012.
	The following unaudited pro forma condensed financial information presents the combined results of operations of the Company and Appro as if the acquisition had occurred on January 1, 2011 (in thousands):
		Year Ended December 31,
		2012				2011
	Revenue	$	494,369			$	291,409
	Net income	$	161,985			$	10,487
	The unaudited pro forma condensed financial information is not intended to represent or be indicative of the results of operations of the Company that would have been reported had the acquisition been completed as of the beginning of the period presented, and should not be taken as representative of the future consolidated results of operations of the Company.
	The goodwill recorded in connection with the acquisition of Appro is primarily related to the synergies expected to be achieved and the value of the assembled workforce. The goodwill balance is not deductible for tax purposes.
	The carrying amount of purchased intangibles at December 31, 2013 was as follows (in thousands):
		31-Dec-13
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Trademarks	$	300		$	67		$	233
	Developed technology	5,400			2,000			3,400
	Customer relationships	1,800			200			1,600
	Non-compete agreements	400			222			178
	Total	$	7,900		$	2,489		$	5,411
	The carrying amount of purchased intangibles at December 31, 2012 was as follows (in thousands):
		31-Dec-12
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Trademarks	$	300		$	7		$	293
	Developed technology	5,400			200			5,200
	Customer relationships	1,800			20			1,780
	Non-compete agreements	400			22			378
	Total	$	7,900		$	249		$	7,651
	Aggregate estimated amortization expense for the years ending December 31 are as follows (in thousands):
	2014	$	2,218
	2015	1,840
	2016	240
	2017	233
	2018	180
		$	4,711
	For the years ended December 31, 2013 and 2012, amortization expense related to purchased intangibles was $2.2 million and $0.2 million, respectively.

Sale_of_Interconnect_Hardware_

Sale of Interconnect Hardware Development Program	12 Months Ended
	Dec. 31, 2013
Sale of Interconnect Hardware Development Program [Abstract]	'
Sale of Interconnect Hardware Development Program	'
	SALE OF INTERCONNECT HARDWARE DEVELOPMENT PROGRAM
	On May 2, 2012, the Company sold its interconnect hardware development program to Intel Corporation (“Intel”) for cash consideration of $140 million. As part of the transaction, 73 of the Company's employees joined Intel, and certain intellectual property and fixed assets were transferred to Intel. The Company retained certain rights to use the transferred assets and intellectual property. As a result of the sale, the Company recorded a gain of $139.1 million in “Net gain on sale of interconnect hardware development program” on the Consolidated Statements of Operations for the year ended December 31, 2012.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENTS
	Under FASB Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures, based on the observability of the inputs used in the valuation techniques used to determine the fair value of certain financial assets and liabilities, the Company is required to provide the following information according to the fair value hierarchy. The fair value hierarchy ranks the quality and reliability of the information used to determine fair values.
	In general, fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities. Fair values determined by Level 2 inputs utilize observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities. Fair values determined by Level 3 inputs are unobservable data points for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. The following table presents information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of December 31, 2013 and 2012, and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):
	Description		Fair Value		Quoted		Significant
			as of		Prices in		Other
			December 31,		Active		Observable
			2013		Markets		Inputs
					(Level 1)		(Level 2)
	Assets:
	Cash, cash equivalents and restricted cash		$	206,401	$	206,401	$	—
	Short-term investments		14,048		14,048		—
	Foreign exchange forward contracts (2)		1,730		—		1,730
	Assets measured at fair value at December 31, 2013		$	222,179	$	220,449	$	1,730
	Liabilities:
	Foreign exchange forward contracts (3)		7,237		—		7,237
	Liabilities measured at fair value at December 31, 2013		$	7,237	$	—	$	7,237
	Description		Fair Value		Quoted		Significant
			as of		Prices in		Other
			December 31,		Active		Observable
			2012		Markets		Inputs
					(Level 1)		(Level 2)
	Assets:
	Cash, cash equivalents and restricted cash		$	253,065	$	253,065	$	—
	Available for sale investments (1)		70,140		70,140		—
	Foreign exchange forward contracts (2)		1,101		—		1,101
	Assets measured at fair value at December 31, 2012		$	324,306	$	323,205	$	1,101
	Liabilities:
	Foreign exchange forward contracts (3)		651		—		651
	Liabilities measured at fair value at December 31, 2012		$	651	$	—	$	651
	_______________________________
	-1	Included in "Short-term investments" and "Long-term investments" on the Company's Consolidated Balance Sheets.
	-2	Included in “Prepaid expenses and other current assets” and “Other non-current assets” on the Company’s Consolidated Balance Sheets.
	-3	Included in “Other accrued liabilities” and “Other non-current liabilities” on the Company’s Consolidated Balance Sheets.
	The fair values of Level 1 assets are determined through market, observable and corroborated sources. The fair values of Level 2 assets and liabilities do not have observable prices, but have inputs that are based on observable inputs, such as foreign currency exchange rates, either directly or indirectly.
	Foreign Currency Derivatives
	As of December 31, 2013 and 2012, the Company had outstanding forward contracts which have been designated as cash flow hedges of anticipated future cash receipts on sales contracts payable in foreign currencies. As of December 31, 2013, the outstanding notional amounts were approximately 36.4 million British Pounds, 53.0 million Euro, 1.2 billion Japanese Yen, 5.6 million Swiss Francs, 3.9 million Canadian Dollars and 3.2 million Singapore Dollars. As of December 31, 2012, the outstanding notional amounts were approximately 57.5 million Euro and 277.9 million Japanese Yen. As of December 31, 2013 and 2012, these contracts hedged foreign currency exposure of approximately $151.4 million and $79.3 million, respectively. The associated cash receipts are expected to be received through 2018, during which time the revenue on the associated sales contracts is expected to be recognized. As of December 31, 2013 and 2012, the fair value of outstanding forward contracts totaled a net loss of $5.5 million and a net gain of $0.5 million, respectively. As of December 31, 2013 and 2012, unrecognized losses, net of tax, of $2.4 million and unrecognized gains, net of tax, of $0.9 million, respectively, were included in “Accumulated other comprehensive income” on the Company’s Consolidated Balance Sheets.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income/(Loss)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income/(Loss) [Abstract]	'
Accumulated Other Comprehensive Income	'
	ACCUMULATED OTHER COMPREHENSIVE INCOME
	The following table shows the gross and net of tax reclassification adjustments from accumulated other comprehensive income resulting from hedged foreign currency transactions recorded by the Company for the years ended December 31, 2013, 2012 and 2011 (in thousands). The gross reclassification adjustments decreased product revenue for the year ended December 31, 2013 and increased product revenue for the years ended December 31, 2012 and 2011, respectively.
			Year Ended
			December 31,
			2013				2012			2011
	Gross of Tax Reclassifications		$	(1,604	)		$	643		$	443
	Net of Tax Reclassifications		$	(962	)		$	386		$	266
	The following tables show the changes in Accumulated Other Comprehensive Income by component for the year ended December 31, 2013 (in thousands):
	Year Ended December 31, 2013
		Unrealized Gain/(Loss) on Investments				Foreign Currency Translation Adjustments			Unrealized Gain/(Loss) on Cash Flow Hedges			Accumulated Other Comprehensive Income
	Beginning balance	$	(46	)		$	4,301		$	926		$	5,181
	Current-period change, net of tax	$	46			$	(1,044	)	$	(3,330	)	$	(4,328	)
	Ending balance	$	—			$	3,257		$	(2,404	)	$	853
	Income tax associated with current-period change	$	31			$	27		$	(2,390	)	$	(2,332	)

Investments

Investments	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Investments	'
	INVESTMENTS
	The Company's investments in debt securities with maturities at purchase greater than three months are classified as "available-for-sale."  Changes in fair value are reflected in other comprehensive income (loss).
	The carrying amount of the Company's investments in available-for-sale securities as of December 31, 2013 was $14.0 million, all of which was classified as short-term. There were no accumulated unrealized gains/(losses) on available-for-sale securities as of December 31, 2013.
	The carrying amount of the Company's investments in available-for-sale securities as of December 31, 2012 is shown in the table below:
					Unrealized
		Due in	Cost		Gains (Losses)			Fair Value
	Short-term available-for-sale securities	2013	$	52,650	$	(87	)	$	52,563
	Long-term available-for-sale securities	2014	17,567		10			17,577
	Total		$	70,217	$	(77	)	$	70,140
	As of December 31, 2013, the Company's debt securities were investment grade and carried a long-term rating of A2/A or higher.

Accounts_and_Other_Receivables

Accounts and Other Receivables, Net	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Accounts and Other Receivables, Net	'
	ACCOUNTS AND OTHER RECEIVABLES, NET
	A summary of net accounts and other receivables follows (in thousands):
		December 31,
		2013			2012
	Trade accounts receivable	$	169,417		$	9,596
	Unbilled receivables	9,075			415
	Advance billings	2,141			278
	Other receivables	2,051			3,156
		182,684			13,445
	Allowance for doubtful accounts	(157		)	(5		)
	Accounts and other receivables, net	$	182,527		$	13,440
	Unbilled receivables represent amounts where the Company has recognized revenue in advance of the contractual billing terms. Advance billings represent billings made based on contractual terms for which no revenue has yet been recognized.
	As of December 31, 2013 and 2012, accounts receivable included $111.9 million and $5.1 million, respectively, due from U.S. government agencies and customers primarily serving the U.S. government. Of this amount, $0.3 million and $0.1 million, respectively, were unbilled, based upon contractual billing arrangements with these customers. As of December 31, 2013 and 2012, no non-U.S. government customer accounted for more than 10% of total accounts and other receivables.

Inventory

Inventory	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Inventory	'
	INVENTORY
	A summary of inventory follows (in thousands):
		31-Dec
		2013		2012
	Components and subassemblies	$	46,339	$	21,865
	Work in process	23,618		11,245
	Finished goods	25,172		56,686
		$	95,129	$	89,796
	As of December 31, 2013 and 2012, $24.8 million and $56.1 million, respectively, of finished goods inventory was located at customer sites pending acceptance. At December 31, 2013, one customer accounted for $18.0 million of finished goods inventory. At December 31, 2012, two customers accounted for $35.9 million of finished goods inventory.
	During 2013, the Company wrote-off $0.9 million of inventory related to the Cray XE, Cray XK and CCS product lines. During 2012, the Company wrote-off $2.3 million of inventory related to the Cray XE and Cray XK product lines. There were no inventory write-offs during 2011.

Property_and_Equipment_Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property and Equipment, Net	'
	PROPERTY AND EQUIPMENT, NET
	A summary of property and equipment follows (in thousands):
		December 31,
		2013			2012
	Land	$	203		$	131
	Buildings	17,022			13,885
	Furniture and equipment	14,443			14,068
	Computer equipment	91,475			80,698
	Leasehold improvements	1,276			420
		124,419			109,202
	Accumulated depreciation and amortization	(94,141		)	(83,659		)
	Property and equipment, net	$	30,278		$	25,543
	Depreciation expense on property and equipment for 2013, 2012 and 2011 was $10.9 million, $7.4 million and $7.6 million, respectively.

Service_Inventory_Net

Service Inventory, Net	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Service Inventory, Net	'
	SERVICE INVENTORY, NET
	A summary of service inventory follows (in thousands):
		December 31,
		2013			2012
	Service inventory	$	16,613		$	15,641
	Accumulated depreciation	(14,785		)	(14,151		)
	Service inventory, net	$	1,828		$	1,490

Deferred_Revenue

Deferred Revenue	12 Months Ended
	Dec. 31, 2013
Deferred Revenue Disclosure [Abstract]	'
Deferred Revenue	'
	DEFERRED REVENUE
	Deferred revenue consisted of the following (in thousands):
		31-Dec
		2013			2012
	Deferred product revenue	$	54,065		$	36,848
	Deferred service revenue	87,900			60,466
	Total deferred revenue	141,965			97,314
	Less long-term deferred revenue	(50,477		)	(29,254		)
	Deferred revenue in current liabilities	$	91,488		$	68,060
	At December 31, 2013, three customers accounted for 47% of total deferred revenue. At December 31, 2012, four customers accounted for 62% of total deferred revenue.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	The Company has recorded rent expense under leases for buildings or office space, which are accounted for as operating leases, in 2013, 2012 and 2011 of $5.3 million, $4.6 million, and $4.9 million, respectively.
	Minimum contractual commitments as of December 31, 2013, were as follows (in thousands):
		Operating		Development
		Leases		Agreements
	2014	$	4,120	$	4,268
	2015	3,596		217
	2016	3,647		25
	2017	2,991		—
	2018	1,534		—
	Thereafter	2,029		—
	Minimum contractual commitments	$	17,917	$	4,510
	In its normal course of operations, the Company engages in development arrangements under which it hires outside engineering resources to augment its existing internal staff in order to complete research and development projects, or parts thereof. For the years ended December 31, 2013, 2012 and 2011, the Company incurred $9.3 million, $4.9 million and $4.7 million for such arrangements, respectively.
	Litigation
	From time to time, the Company is subject to various legal proceedings that arise in the ordinary course of business, none of which are currently material to the Company’s business.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	Income taxes are recognized for the amount of taxes payable for the current year and for the impact of deferred tax assets and liabilities, which represent consequences of events that have been recognized differently in the financial statements under GAAP than for tax purposes.
	Most of the Company’s deferred tax assets result from net operating loss carryforwards. As of December 31, 2013, the Company had U.S. federal net operating loss carryforwards of approximately $129.4 million, of which approximately $43.0 million was related to stock-based income tax deductions in excess of amounts that have been recognized for financial reporting purposes. Any reduction of taxes payable for stock-based income tax deductions in excess of amounts that have been recognized for financial reporting purposes will be directly credited to shareholders’ equity. As of December 31, 2013, the Company had gross federal research and development tax credit carryforwards of approximately $20.1 million. The federal net operating loss carryforwards will expire from 2019 through 2031, and the research and development tax credits will expire from 2021 through 2033 if not utilized. Utilization of the Company’s federal net operating loss and research and development tax credit carryforwards generated prior to May 10, 2001 are limited under Section 382 of the Internal Revenue Code. As of December 31, 2013, the Company had approximately $11.2 million of foreign net operating loss carryforwards in various jurisdictions. Most of the Company’s foreign net operating losses can be carried forward indefinitely, with certain amounts expiring from 2014 to 2022.
	Income (loss) before income taxes consisted of the following (in thousands):
			Year Ended December 31,
			2013			2012			2011
	United States		$	17,467		$	161,592		$	(2,847	)
	International		3,562			7,140			2,982
	Total		$	21,029		$	168,732		$	135
	The tax provision (benefit) for income taxes related to operations consisted of the following (in thousands):
			Year Ended December 31,
			2013			2012			2011
	Current provision (benefit):
	Federal		$	484		$	1,162		$	(106	)
	State		696			2,768			37
	Foreign		801			541			271
	Total current provision		1,981			4,471			202
	Deferred (benefit) provision:
	Federal		(13,160		)	1,362			(12,935		)
	State		(327		)	1,415			(936		)
	Foreign		312			243			(525		)
	Total deferred (benefit) provision		(13,175		)	3,020			(14,396		)
	Total (benefit) provision for income taxes		$	(11,194	)	$	7,491		$	(14,194	)
	The tax provision (benefit) differs from the amount computed by applying the federal statutory income tax rate as follows (in thousands):
			Year Ended December 31,
			2013			2012			2011
	Income tax provision at statutory rate		$	7,360		$	59,056		$	47
	State taxes, net of federal benefit		369			4,183			(972		)
	Foreign income taxes		(749		)	(518		)	(406		)
	Stock compensation adjustment		(8,419		)	—			—
	Deemed dividends for U.S. income tax purposes		477			2,352			338
	Nondeductible expenses		208			549			242
	Liquidation of subsidiary		—			(30,704		)	—
	Disallowed compensation		19			492			—
	Research and development tax credit		(5,736		)	—			(1,524		)
	Effect of change in valuation allowance on deferred tax assets		(4,723		)	(27,919		)	(11,919		)
	Effective income tax provision (benefit)		$	(11,194	)	$	7,491		$	(14,194	)
	Significant components of the Company’s deferred income tax assets and liabilities follow (in thousands):
			December 31,
			2013			2012
	Current:
	Deferred Income Tax Assets
	Inventory		$	3,388		$	5,397
	Accrued compensation		460			912
	Deferred revenue		12,100			6,185
	Net operating loss carryforwards		5,922			3,467
	Other		8,120			1,092
	Gross current deferred tax assets		29,990			17,053
	Valuation allowance		(20,107		)	(13,970		)
	Current deferred tax assets		9,883			3,083
	Deferred Income Tax Liabilities
	Other		(688		)	—
	Current deferred tax liabilities		(688		)	—
	Net current deferred tax assets		$	9,195		$	3,083
	Long-Term:
	Deferred Income Tax Assets
	Property and equipment		$	328		$	411
	Research and experimentation credit carryforwards		23,941			18,301
	Net operating loss carryforwards		47,154			59,039
	Goodwill		628			912
	Other		10,161			5,563
	Gross long-term deferred tax assets		82,212			84,226
	Valuation allowance		(57,687		)	(68,547		)
Long-term deferred tax assets		24,525			15,679
Deferred Income Tax Liabilities
Property and equipment		(1,905		)	(1,363		)
Intangible assets		(2,059		)	(3,002		)
Other		(1,355		)	(1,273		)
Long-term deferred tax liabilities		(5,319		)	(5,638		)
Net long-term deferred tax asset		$	19,206		$	10,041
The Company’s net current deferred tax asset is included in prepaid expenses and other current assets in the Company’s Consolidated Balance Sheets.
The Company recorded an income tax benefit of $11.2 million, income tax expense of $7.5 million and an income tax benefit of $14.2 million during the years ended December 31, 2013, 2012 and 2011, respectively. The tax benefit recorded by the Company during the year ended December 31, 2013 was primarily attributable to a partial reduction, in the amount of $13.5 million, of the valuation allowance held against the Company’s U.S. deferred tax assets. The primary reason for the difference between the income tax provision at the statutory rate and the Company's effective income tax provision for the year ended December 31, 2012 is that the gain from the sale of the Company's interconnect hardware development program did not result in significant income tax expense. The Company had existing deferred tax assets that were subject to valuation allowances and deductible temporary differences that were previously unrecognized. The sale of the interconnect hardware development program was never anticipated in previous evaluations of the realizability of the Company's deferred tax assets and consequently the sale, together with a tax benefit that was recognized as a result of a restructuring of a subsidiary, resulted in the Company's ability to experience a relatively small tax consequence from the sale. The tax benefit recorded by the Company during the year ended December 31, 2011 was primarily attributable to a partial reduction, in the amount of $13.9 million, of the valuation allowance held against the Company's U.S. deferred tax assets and the complete reduction, in the amount of $0.8 million, of the valuation allowance held against the deferred tax assets of the Company's German subsidiary.
The partial reduction, in the amount of $13.5 million, of the valuation allowance held against the Company’s U.S. deferred tax assets during the year ended December 31, 2013 was due to actual income from operations during the year ended December 31, 2013 exceeding amounts previously used in the evaluation of the realizability of the Company's deferred tax assets at the beginning of the year and based upon an assessment of all positive and negative evidence relating to future years. The Company considers its actual historical results over several years to have stronger weight than other more subjective indicators when considering whether to establish or reduce a valuation allowance on deferred tax assets.
During the year ended December 31, 2012 the Company reduced the valuation allowance held against its deferred tax assets by $18.4 million as a result of the sale of the Company's interconnect hardware development program. The Company further reduced the valuation allowance held against its U.S. deferred tax assets by $10.7 million during the year ended December 31, 2012 due to actual income from operations during the year ended December 31, 2012 exceeding amounts previously used in the evaluation of the realizability of the Company's deferred tax assets at the beginning of the year and based upon an assessment of all positive and negative evidence relating to future years.
The tax benefit recorded by the Company during the year ended December 31, 2011 was primarily attributable to a partial reduction, in the amount of $13.9 million, of the valuation allowance held against the Company’s U.S. deferred tax assets and the complete reduction, in the amount of $0.8 million, of the valuation allowance held against the deferred tax assets of the Company’s German subsidiary.
The assessment of the Company's ability to utilize its deferred tax assets included an assessment of all known business risks and industry trends as well as forecasted domestic and international earnings over a number of years. The Company considers its actual results over several years to have stronger weight than other more subjective indicators, including forecasts, when considering whether or not to establish or reduce a valuation allowance on deferred tax assets and believes that its ability to forecast results significantly into the future is severely limited due to the rapid rate of technological and competitive change in the industry in which it operates. The Company's conclusion about the realizability of its deferred tax assets, and therefore the appropriateness of the valuation allowance, is reviewed quarterly and could change in future periods depending on the Company's future assessment of all available evidence in support of the likelihood of realization of its deferred tax assets. If the Company's conclusion about the realizability of its deferred tax assets and therefore the appropriateness of its valuation allowance changes in a future period it could record a substantial tax provision or benefit in the Consolidated Statement of Operations when that occurs.
The Company generated more income from operations in the United States in 2012 and 2013 than anticipated when initially forecasting those amounts in connection with determining its valuation allowance for deferred income taxes. In 2011 the Company generated almost no income, while anticipating higher income. The Company currently forecasts that it will generate income from operations in 2014 and in the next few years.  The Company’s current forecasts are based upon a number of critical assumptions which include, but are not limited to, customer demand for products and services, success of growth initiatives and relationships with key supply chain partners. Historically, the Company's ability to forecast results significantly into the future has been severely limited due to the rapid rate of technological and competitive change in the industry in which it operates.   If the Company's actual income exceeds its current forecasts in 2014 and if the forecasts for future periods continue to improve over time as they did in 2012 and 2013, the Company will again be required to reduce substantial amounts of its remaining valuation allowance held against its U.S. deferred tax assets.
The valuation allowance on deferred tax assets decreased by $4.7 million, $27.9 million and $17.5 million in 2013, 2012 and 2011, respectively. The decrease in the valuation allowance for the year ended December 31, 2013 was comprised of the partial release of the valuation allowance of $13.5 million which was principally offset by a stock compensation related adjustment of $8.4 million.
Undistributed earnings relating to the Company’s foreign subsidiaries are considered to be permanently reinvested; accordingly, no provision for U.S. federal and state income taxes has been provided thereon. Upon repatriation of those earnings, in the form of dividends or otherwise, the Company would be subject to both U.S. income taxes (subject to an adjustment for foreign tax credits) and withholding taxes payable to the various foreign countries. Determination of the amount of unrecognized deferred U.S. income tax liability is not practicable due to the complexities associated with this hypothetical calculation. As of December 31, 2013, the Company’s foreign subsidiaries held cash in the amount of $30.6 million.
The following table summarizes changes in the amount of the Company’s unrecognized tax benefits for uncertain tax positions for the three years ended December 31, 2013 (in thousands):
Balance at December 31, 2010	$	20
Lapse of statute of limitations	(20		)
Balance at December 31, 2011	$	—
Increase related to current year income tax positions	470
Balance at December 31, 2012	$	470
Decrease related to prior year income tax positions	(268		)
Balance at December 31, 2013	$	202
The balance of unrecognized tax benefits as of December 31, 2013 was $0.2 million of tax benefits that, if recognized, would affect the effective tax rate.
The Company or its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. The Company defines its major tax jurisdictions to include Australia, Germany, the United Kingdom and the United States. The Company is no longer subject to income tax examinations with respect to Australia for periods before 2008 and for periods before 2012 in Germany and the United Kingdom, respectively. With respect to the U.S. federal and various state jurisdictions the Company is no longer subject to income tax examinations with respect to periods before 2010, although in such jurisdictions net operating loss and tax credit carryforwards generated in a year are subject to examination and adjustment for at least three years following the year in which such losses or credits are actually used to offset taxable income.
Estimated interest and penalties are recorded as a component of interest expense and other expense, respectively. Such amounts were not material for 2013, 2012 and 2011.

Lines_of_Credit

Lines of Credit	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Credit Facilities	'
	CREDIT FACILITIES
	As of December 31, 2013, the Company had a $10.0 million unsecured line of credit with Wells Fargo Bank, National Association. This facility has a maturity date of October 15, 2014.  As of December 31, 2013, the Company had a $10.0 million letter of credit facility with Silicon Valley Bank.  This facility is unsecured and may be used only to support the issuance of letters of credit.  This facility has a maturity date of October 17, 2014. The Company made no draws and had no outstanding borrowings on any credit facilities as of December 31, 2013.
	As of December 31, 2013, the Company had $32.7 million in outstanding letters of credit and $13.8 million in long-term restricted cash associated with certain letters of credit outstanding to secure customer prepayments.

Shareholders_Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]	'
Shareholders' Equity	'
	SHAREHOLDERS’ EQUITY
	Preferred Stock:    The Company has 5,000,000 shares of undesignated preferred stock authorized, and no shares of preferred stock outstanding.
	Common Stock:    The Company has 75,000,000 authorized shares of common stock with a par value of $0.01 per share.
	Restricted Stock and Restricted Stock Units:    During 2013, 2012 and 2011, respectively, the Company issued an aggregate of 755,979, 1,316,447, and 513,587 shares of restricted stock, respectively, to certain directors, executives and other employees. The grant date fair value of these grants was approximately $15.8 million, $15.8 million, and $3.1 million for 2013, 2012 and 2011, respectively. Stock compensation expense is recorded over the vesting period, which has generally been two years for non-employee directors and four years for officers and employees of the Company. As of December 31, 2013, $25.2 million remains to be expensed over the remaining vesting periods of these grants. This includes $16.3 million for performance vesting restricted stock subject to performance measures which are currently not considered probable and $0.3 million for performance vesting restricted stock subject to performance measures which currently are considered probable. No compensation expense is recorded for performance vesting restricted stock subject to performance measures which are not considered probable.
	As of December 31, 2012 and 2011, the Company had issued and outstanding 12,500 and 15,000 restricted stock units, respectively. There were no restricted stock units issued and outstanding as of December 31, 2013. Restricted stock units have similar vesting characteristics as restricted stock but are not outstanding shares and do not have any voting or dividend rights. The Company records stock-based compensation expense over the vesting period. Once a restricted stock unit vests, a share of common stock of the Company will be issued.
	Stock Option Plans:    As of December 31, 2013, the Company had one active equity incentive plan that provides shares available for option grants to employees, directors, executives and others. Options granted to employees under the Company’s equity incentive plan typically vest over four years or as otherwise determined by the plan administrator. Options to purchase shares expire no later than ten years after the date of grant.
	In determining the fair value of stock options, the Company used the Black-Scholes option pricing model that employed the following key weighted average assumptions:
		2013				2012				2011
	Risk-free interest rate	0.98		%		0.56		%		0.67		%
	Expected dividend yield	—		%		—		%		—		%
	Volatility	50.45		%		74.84		%		74.37		%
	Expected life (in years)	4				4				4
	Weighted average Black-Scholes value of options granted	$	8.22			$	6.56			$	3.34
	The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The Company does not anticipate declaring dividends in the foreseeable future. Volatility is based on historical data. The expected life of an option was based on the assumption that options will be exercised, on average, about two years after vesting occurs. The Company recognizes compensation expense for only the portion of options or stock units that are expected to vest. Therefore, management applies an estimated forfeiture rate that is derived from historical employee termination data and adjusted for expected future employee turnover rates. The estimated forfeiture rates applied for the years ended December 31, 2013, 2012 and 2011 were 10.0%, 6.6%, and 5.2%, respectively. If the actual number of forfeitures differs from those estimated by management, additional adjustments to compensation expense may be required in future periods. The Company’s stock price volatility, option lives and expected forfeiture rates involve management’s best estimates at the time of such determination, all of which impact the fair value of the option calculated under the Black-Scholes methodology and, ultimately, the expense that will be recognized over the life of the option.
	A summary of the Company’s stock option activity and related information follows:
		Options			Weighted				Weighted Average Remaining
					Average				Contractual
					Exercise				Term (Years)
					Price
	Outstanding at January 1, 2011	3,445,710			$	6.2
	Granted	476,500			6.08
	Exercised	(248,271	)		4.39
	Canceled and forfeited	(256,019	)		6.65
	Outstanding at December 31, 2011	3,417,920			6.28
	Granted	359,500			11.9
	Exercised	(1,346,326	)		5.52
	Canceled and forfeited	(137,589	)		11.35
	Outstanding at December 31, 2012	2,293,505			7.31
	Granted	346,360			20.65
	Exercised	(495,221	)		6.38
	Canceled and forfeited	(66,575	)		21.97
	Outstanding at December 31, 2013	2,078,069			9.29				7
	Exercisable at December 31, 2013	1,233,951			6.35				5.9
	Available for grant at December 31, 2013	3,171,322
	As of December 31, 2013, there was $37.8 million of aggregate intrinsic value of outstanding stock options, including $26.0 million of aggregate intrinsic value of exercisable stock options. Intrinsic value is the total pretax intrinsic value for all “in-the-money” options (i.e., the difference between the Company’s closing stock price on the last trading day of 2013 and the exercise price, multiplied by the number of shares) that would have been received by the option holders had all option holders exercised their options as of December 31, 2013. This amount changes, based on the fair market value of the Company’s stock. Total intrinsic value of options exercised was $7.9 million, $7.6 million, and $0.5 million for the years ended December 31, 2013, 2012 and 2011, respectively.
	A summary of the Company’s unvested restricted stock and restricted stock unit grants and changes during the years ended December 31 was as follows:
		Shares			Weighted
					Average
					Grant Date
					Fair Value
	Outstanding at January 1, 2011	1,380,491			$	4.77
	Granted	513,587			6.04
	Forfeited	(146,677	)		5.29
	Vested	(444,987	)		4.03
	Outstanding at December 31, 2011	1,302,414			5.47
	Granted	1,316,447			11.99
	Forfeited	(31,771	)		7.64
	Vested	(384,352	)		5.86
	Outstanding at December 31, 2012	2,202,738			9.27
	Granted	755,979			20.93
	Forfeited	(75,437	)		14.48
	Vested	(661,580	)		6.22
	Outstanding at December 31, 2013	2,221,700			13.97
	The total number of restricted shares outstanding as of December 31, 2013 and 2012 included 1,081,500 and 737,000 performance vesting restricted shares subject to performance conditions that are currently not considered probable of vesting, respectively. There were no performance vesting restricted shares outstanding as of December 31, 2011.
	The aggregate fair value of restricted shares vested during 2013, 2012 and 2011 was $14.0 million, $4.2 million, and $2.9 million, respectively.
	As of December 31, 2013, the Company had $29.9 million of total unrecognized compensation cost related to unvested stock options and unvested restricted stock grants. This includes $16.3 million for performance vesting restricted stock subject to performance measures which are currently not considered probable and $0.3 million for performance vesting restricted stock subject to performance measures which currently are considered probable. No compensation expense is recorded for performance vesting restricted stock subject to performance measures which are not considered probable. Unrecognized compensation cost related to unvested stock options and unvested restricted stock grants considered probable of vesting is expected to be recognized over a weighted average period of 1.9 years.
	Outstanding and exercisable options by price range as of December 31, 2013, were as follows:
		Outstanding Options									Exercisable Options
	Range of Exercise	Number			Weighted		Weighted				Number		Weighted
	Prices per Share	Outstanding			Average		Average				Exercisable		Average
					Remaining		Exercise						Exercise
					Life (Years)		Price						Price
	$ 0.00 - $ 4.00	348,488			5.3		$	3.72			348,488		$	3.72
$ 4.01 - $ 6.00	352,269			6.1		$	5.47			296,668		$	5.47
$ 6.01 - $ 8.00	564,801			6.8		$	6.28			343,010		$	6.4
$ 8.01 - $ 50.28	812,511			8.3		$	15.42			245,785		$	11.09
$ 0.00 - $ 50.28	2,078,069			7		$	9.29			1,233,951		$	6.35
The following table (in thousands) sets forth the share-based compensation cost resulting from stock options and stock grants recorded in the Company’s Consolidated Statements of Operations for the years ended December 31, 2013, 2012 and 2011.
	2013				2012				2011
Cost of product revenue	$	135			$	57			$	177
Cost of service revenue	229				258				369
Research and development	1,480				1,327				784
Sales and marketing	2,230				1,717				490
General and administrative	3,165				2,604				1,808
Total share-based compensation expense	$	7,239			$	5,963			$	3,628
Employee Stock Purchase Plan (ESPP):    Under the Company’s employee stock purchase plan, the maximum number of shares of the Company’s common stock that employees could acquire under the ESPP is 1,750,000 shares. Eligible employees are permitted to acquire shares of the Company’s common stock through payroll deductions not exceeding 15% of base wages. The purchase price per share under the ESPP is 95% of the closing market price on the fourth business day after the end of each offering period. As of December 31, 2013, 2012 and 2011, 1,022,610, 998,118 and 959,784 shares, respectively, had been issued under the ESPP.

Benefit_Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]	'
Benefit Plans	'
	BENEFIT PLANS
	401(k) Plan
	For the three years ended December 31, 2013, the Company’s retirement plan covered substantially all U.S. employees and provided for voluntary salary deferral contributions on a pre-tax basis in accordance with Section 401(k) of the Internal Revenue Code of 1986, as amended. The Company matches a portion of employee contributions. The 2013, 2012 and 2011 Company match expense was $1.2 million, $1.0 million and $1.1 million, respectively.
	Pension Plan
	The Company’s German subsidiary maintains a defined benefit pension plan. At December 31, 2013, the excess of plan assets over the projected benefit obligation of $2.6 million was $0.2 million. At December 31, 2012, the excess of plan assets over the projected benefit obligation of $2.4 million was $0.1 million. Plan assets are invested in insurance policies payable to employees. Net pension expense was not material for any period. Contributions to the plan are not expected to be significant to the financial position of the Company.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	SEGMENT INFORMATION
	The Company has the following reportable segments: HPC Systems, Maintenance and Support, and Storage and Data management. The Company's reportable segments represent components of the Company for which separate financial information is available that is utilized on a regular basis by the Chief Executive Officer, who is the Chief Operating Decision Maker, in determining how to allocate the Company’s resources and evaluate performance. The segments are determined based on several factors, including the Company’s internal operating structure, the manner in which the Company’s operations are managed, client base, similar economic characteristics and the availability of separate financial information.
	HPC Systems
	HPC Systems revenue reported reflects a suite of highly advanced systems, including the Cray XC30, CS-300, Cray XE6, Cray XE6m, Cray XK7, Cray XK6m, and other HPC products, which are used by single users all the way up through large research centers.
	Maintenance and Support
	Maintenance and Support provides ongoing maintenance of Cray HPC and big data systems and systems analysts to help customers achieve their mission objectives.
	Storage and Data Management
	Storage and Data Management revenue reported includes the Cray Sonexion and other third-party storage products,
	Engineering Services and Other
	Included within Engineering Services and Other is the Company's YarcData business and Custom Engineering.
	The following table presents revenues and gross margin for the Company’s operating segments for the years ended December 31 (in thousands):
		2013		2012		2011
	Revenue:
	HPC Systems	$	369,623	$	298,255	$	139,590
	Maintenance and Support	77,842		62,244		62,386
	Storage and Data Management	63,887		50,246		7,197
	Engineering Services and Other	14,397		10,313		26,873
	Total revenue	$	525,749	$	421,058	$	236,046
	Cost of Revenue:
	HPC Systems	$	259,167	$	193,296	$	90,686
	Maintenance and Support	39,233		36,510		31,558
	Storage and Data Management	38,165		35,642		6,557
	Engineering Services and Other	4,858		4,432		12,879
	Total cost of revenue	$	341,423	$	269,880	$	141,680
	Gross Profit:
	HPC Systems	$	110,456	$	104,959	$	48,904
	Maintenance and Support	38,609		25,734		30,828
	Storage and Data Management	25,722		14,604		640
	Engineering Services and Other	9,539		5,881		13,994
	Total gross profit	$	184,326	$	151,178	$	94,366
	Revenue and cost of revenue is the only discrete financial information the Company prepares for its segments. Other financial results or assets are not separated by segment.
	There were no material sales between operating segments, and accordingly, no inter-segment revenue has been reported.
	Product and service revenue and long-lived assets classified by significant country were as follows (in thousands):
		United		All		Total
		States		Other
				Countries
	For the year ended December 31, 2013:
	Product revenue	$	297,583	$	138,747	$	436,330
	Service revenue	$	62,072	$	27,347	$	89,419
	Long-lived assets	$	58,910	$	6,146	$	65,056
	For the year ended December 31, 2012:
	Product revenue	$	301,162	$	52,605	$	353,767
	Service revenue	$	42,359	$	24,932	$	67,291
	Long-lived assets	$	57,549	$	4,460	$	62,009
	For the year ended December 31, 2011:
	Product revenue	$	95,929	$	59,632	$	155,561
	Service revenue	$	56,660	$	23,825	$	80,485
	Long-lived assets	$	28,281	$	4,085	$	32,366
	Revenue attributed to foreign countries is derived from sales to customers located outside the United States. Revenue derived from U.S. government agencies or commercial customers primarily serving the U.S. government, and therefore under its control, totaled approximately $266.1 million, $286.9 million and $127.8 million in 2013, 2012 and 2011, respectively. In 2013, two customers accounted for an aggregate of approximately 22% of total revenue. In 2012, three customers accounted for an aggregate of approximately 63% of total revenue. In 2011, two customers accounted for an aggregate of approximately 30% of total revenue. In general, concentrations of revenue by customer encompass all segments. In 2013 and 2012, no foreign country accounted for more than 10% of the Company's revenue. In 2011, revenue in Germany accounted for 12% of total revenue.

Research_and_Development

Research and Development	12 Months Ended
	Dec. 31, 2013
Research and Development [Abstract]	'
Research and Development	'
	RESEARCH AND DEVELOPMENT
	The detail for the Company’s net research and development costs for the years ended December 31 follows (in thousands):
		2013			2012			2011
	Gross research and development expenses	$	92,469		$	86,305		$	76,993
	Less: Amounts included in cost of revenue	(3,741		)	(1,080		)	(410		)
	Less: Reimbursed research and development (excludes amounts in revenue)	(1,000		)	(20,922		)	(27,131		)
	Net research and development expenses	$	87,728		$	64,303		$	49,452

Interest_Income_Expense

Interest Income (Expense)	12 Months Ended
	Dec. 31, 2013
Other Income and Expenses [Abstract]	'
Interest Income (Expense)	'
	INTEREST INCOME (EXPENSE)
	The detail of interest income (expense) for the years ended December 31 follows (in thousands):
		2013			2012			2011
	Interest income	$	894		$	397		$	229
	Interest expense	(137		)	(193		)	(262		)
	Net interest income (expense)	$	757		$	204		$	(33	)
	Interest income is earned by the Company on cash and cash equivalent and investment balances.

Quarterly_Data_Unaudited

Quarterly Data (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Data (Unaudited)	'
	QUARTERLY DATA (UNAUDITED)
	The following table presents unaudited quarterly financial information for the two years ended December 31, 2013. In the opinion of management, this information contains all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation thereof.
	The operating results are not necessarily indicative of results for any future periods. Quarter-to-quarter comparisons should not be relied upon as indicators of future performance. The Company’s business is driven by a few significant contracts and, as a result, the Company’s operating results are subject to very large quarterly fluctuations.
	(In thousands, except per share data)
		2013											2012
	For the Quarter Ended	31-Mar			30-Jun			30-Sep			31-Dec		31-Mar		30-Jun		30-Sep			31-Dec
	Revenue	$	79,547		$	84,467		$	54,366		$	307,369	$	112,307	$	84,183	$	35,739		$	188,829
	Cost of revenue	55,397			57,666			33,940			194,420		67,151		49,688		18,407			134,634
	Gross profit	24,150			26,801			20,426			112,949		45,156		34,495		17,332			54,195
	Research and development, net	20,226			19,968			21,555			25,979		23,750		6,893		15,483			18,177
	Sales and marketing	11,143			11,550			11,480			17,172		7,873		10,233		6,495			12,579
	General and administrative	5,485			5,085			4,970			8,063		5,130		4,971		3,324			7,282
	Net income (loss)	(7,609		)	(150		)	(11,025		)	51,007		4,964		147,422		(5,151		)	14,006
	Net income (loss) per common share, basic	$	(0.20	)	$	—		$	(0.29	)	$	1.33	$	0.14	$	4.05	$	(0.14	)	$	0.38
	Net income (loss) per common share, diluted	$	(0.20	)	$	—		$	(0.29	)	$	1.27	$	0.13	$	3.9	$	(0.14	)	$	0.36
	Net income in the second quarter of 2012 included a gain of $139.1 million from the sale of the Company's interconnect hardware development program.

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]	'
Schedule of Valuation and Qualifying Accounts	'
	Schedule II — Valuation and Qualifying Accounts(1)
	December 31, 2013
	(In Thousands)
	Description		Balance at		Charge/(Benefit)			Deductions			Balance at
			Beginning		to Expense						End of
			of Period								Period
	Year ended December 31, 2011:
	Allowance for doubtful accounts		$	123	$	(13	)	$	—		$	110
	Year ended December 31, 2012:
	Allowance for doubtful accounts		$	110	$	(62	)	$	(43	)	$	5
	Year ended December 31, 2013:
	Allowance for doubtful accounts		$	5	$	179		$	(27	)	$	157
	-1	The Company does not have any warranty liabilities.
	-2	Deductions represent uncollectible accounts written off, net of recoveries.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation
	The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated.
Reclassifications	'
	Reclassifications
	Certain prior year amounts have been reclassified to conform with the current year presentation. There has been no impact on previously reported net income or shareholders’ equity from such reclassifications.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Company’s consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates.
Cash, Cash Equivalents and Restricted Cash	'
	Cash, Cash Equivalents and Restricted Cash
	Cash and cash equivalents consist of highly liquid financial instruments that are readily convertible to cash and have maturities of three months or less at the time of acquisition. The Company maintains cash and cash equivalent balances with financial institutions that exceed federally insured limits. As of December 31, 2013, the Company had $13.8 million in long-term restricted cash associated with certain letters of credit outstanding to secure customer prepayments. The Company had no restricted cash balances as of December 31, 2012.
Investments	'
	Investments
	The Company's investments consist primarily of commercial paper, corporate debt, and other debt securities. Debt securities are classified as available-for-sale and are reported at fair value with unrealized gains and losses, net of applicable taxes, recorded in accumulated other comprehensive income, a component of shareholders' equity. The realized gains and losses for available-for-sale securities are included in other income and expense in the Consolidated Statements of Operations. Realized gains and losses are calculated based on the specific identification method.
	The Company monitors its investment portfolio for impairment on a periodic basis. When the carrying value of an investment in debt securities exceeds its fair value and the decline in value is determined to be an other-than-temporary decline, and when the Company does not intend to sell the debt security and it is not more likely than not that the Company will be required to sell the debt securities prior to recovery of its amortized cost basis, the Company records an impairment charge in the amount of the credit loss and the balance, if any, to other comprehensive income (loss).
	Investments that mature between three months and one year from the purchase date are initially classified as short-term investments in the Consolidated Balance Sheet. Investments that mature beyond one year from the purchase date are initially classified as long-term investments in the Consolidated Balance Sheet.
	The Company's investments in debt securities with maturities at purchase greater than three months are classified as "available-for-sale."  Changes in fair value are reflected in other comprehensive income (loss).
Foreign Currency Derivatives	'
	Foreign Currency Derivatives
	The Company uses forward foreign currency exchange contracts to hedge certain foreign currency exposures. Forward contracts are cash flow hedges of the Company’s foreign currency exposures on certain revenue contracts and are recorded at the contract’s fair value. Any gains or losses on the effective portion of the forward contract is initially reported in “Accumulated other comprehensive income,” a component of shareholders’ equity, with a corresponding asset or liability recorded based on the fair value of the forward contract. When the hedged transaction is settled, any unrecognized gains or losses on the hedged transaction are reclassified into results of operations in the same period. Any hedge ineffectiveness is recorded to operations in the current period. The Company measures hedge effectiveness by comparing changes in fair values of the forward contract and expected cash flows based on changes in the spot prices of the underlying currencies. Cash flows from forward contracts accounted for as cash flow hedges are classified in the same category as the cash flows from the items being hedged. The Company does not use derivative financial instruments for speculative purposes.
Concentration of Credit Risk	'
	Concentration of Credit Risk
	Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents, available-for-sale investments, accounts receivable, long-term restricted cash and forward foreign currency exchange contracts.
	The Company maintains cash and cash equivalents, available-for-sale securities and forward contracts with various financial institutions. As part of its risk management process, the Company performs periodic evaluations of the relative credit standing of the financial institutions. The Company has not sustained any credit losses from instruments held at financial institutions. The Company utilizes forward contracts to protect against the effects of foreign currency fluctuations. Such contracts involve the risk of non-performance by the counterparty, which could result in a material loss.
	The Company currently derives a significant portion of its revenue from sales of products and services to different agencies of the U.S. government or commercial customers primarily serving various agencies of the U.S. government. See Note 18 — Segment Information for additional information. Given the type of customers, the Company does not believe its accounts receivable represent significant credit risk.
Other Concentration	'
	Other Concentration
	The Company obtains certain components from single source suppliers due to technology, availability, price, quality or other considerations. The loss of a single source supplier, the single source supplier’s inability to deliver the required components or intellectual property due to natural disaster or other reasons, the deterioration of the relationship with a single source supplier, or any unilateral modification of contract terms under which the Company is supplied components by a single source supplier could have a significant adverse effect on the Company’s revenue and gross margins.
Accounts Receivable	'
	Accounts Receivable
	Accounts receivable are stated at principal amounts and are primarily comprised of amounts contractually due from customers for products and services and amounts due from government research and development contracts. The Company provides an allowance for doubtful accounts based on an evaluation of customer past due account balances. In determining whether to record an allowance for a specific customer, the Company considers a number of factors, including prior payment history and financial information for the customer.
Fair Values of Financial Instruments	'
	Fair Values of Financial Instruments
	The Company measures certain financial assets and liabilities at fair value based on the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. The Company’s financial instruments primarily consist of debt securities, time deposits, money market funds, and foreign currency derivatives. See Note 5 for a further discussion on fair value of financial instruments.
Inventories	'
	Inventories
	Inventories are valued at the lower of cost or market, with cost computed on a first-in, first-out basis. The Company regularly evaluates the technological usefulness and anticipated future demand for various inventory components and the expected use of the inventory. When the Company determines it is not likely the cost of inventory items will be recovered through future sales, the Company writes-down the related inventory to its estimated market value.
	In connection with certain of its sales agreements, the Company may receive used equipment from a customer. This inventory generally will be recorded at no value based on the expectation that the Company will not be able to resell or otherwise use the equipment. In the event that the Company has a specific contractual plan for resale at the date the inventory is acquired, the inventory is recorded at its estimated fair value.
Property and Equipment and Intangible Assets	'
	Property and Equipment and Intangible Assets, net
	Property and equipment are recorded at cost less accumulated depreciation and amortization. Additions and improvements are capitalized and maintenance and repairs are expensed as incurred. Depreciation is calculated on a straight-line basis over the estimated useful lives of the related assets, ranging from 18 months to seven years for furniture and fixtures, three years for computer equipment, and eight years to 25 years for buildings and land improvements. Leasehold improvements are depreciated over the life of the lease or asset, whichever is shorter.
	The Company amortizes purchased intangible assets with finite lives using the straight-line method over the estimated economic lives of the assets, ranging from two to ten years.
Service Inventory	'
	Service Inventory
	Service inventory is valued at the lower of cost or market and represents inventory used to support service and maintenance agreements with customers. As inventory is utilized, replaced items are returned to us and are either repaired or scrapped. Costs incurred to repair inventory to a usable state are charged to expense as incurred. Service inventory is recorded at cost and is amortized over the estimated service life of the related product platform (generally four years).
Impairment of Long-Lived Assets and Intangibles	'
	Impairment of Long-Lived Assets and Intangibles
	The Company evaluates property, plant and equipment and intangible assets with finite lives for impairment whenever events or changes in circumstances indicate the carrying value of an asset may not be recoverable. The Company assesses the recoverability of the assets based on the undiscounted future cash flow the assets are expected to generate and recognizes an impairment loss when estimated undiscounted future cash flow expected to result from the use of the asset plus net proceeds expected from disposition of the asset, if any, are less than the carrying value of the asset. When the Company identifies an impairment, the carrying value of the asset is reduced to its estimated fair value based on a discounted cash flow approach or, when available and appropriate, to comparable market values.
Goodwill	'
	Goodwill
	Goodwill is not amortized but is tested for impairment at least annually. The Company reviews goodwill for impairment annually at the beginning of its fourth fiscal quarter and whenever events or changes in circumstances indicate the carrying value of the asset may not be recoverable. The goodwill impairment test consists of a two-step process, if necessary. However, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in ASC Topic 350. The more likely than not threshold is defined as having a likelihood of more than 50 percent. If, after assessing the totality of events or circumstances, the Company determines that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary and goodwill is considered to be unimpaired. However, if based on the qualitative assessment the Company concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, the Company will proceed with performing the two-step process.
	In step one, the Company determines the fair value of each reporting unit and compares it to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, goodwill is not impaired and no further testing is performed. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, the Company records an impairment loss equal to the difference.
	The Company performed its qualitative assessment during the fourth fiscal quarter of 2013 and concluded that it was more likely than not that the fair values of its reporting units were greater than their carrying amounts. After reaching this conclusion, the two-step impairment test was unnecessary and no further testing was performed. The qualitative factors that were considered included, but were not limited to, general economic conditions, outlook for the HPC and big data markets, recent and forecasted financial performance and the price of the Company's common stock.
Business Combinations	'
	Business Combinations
	The Company accounts for business combinations using the acquisition method of accounting and allocates the purchase price to the tangible and intangible assets acquired and the liabilities assumed based upon their estimated fair values at the acquisition date. The difference between the purchase price and the fair value of the net assets acquired is recorded as goodwill. The Company uses estimates and assumptions to accurately value assets acquired and liabilities assumed at the acquisition date. During the measurement period, which may be up to one year from the acquisition date, any refinements made to the fair value of the assets and liabilities assumed are recorded with retrospective effect.
	The fair values of intangible assets acquired are estimated using a discounted cash flow approach with Level 3 inputs. Under this method, an intangible asset’s fair value is equal to the present value of the incremental after-tax cash flows (excess earnings) attributable solely to the intangible asset over its remaining useful life. To calculate fair value, the Company uses risk-adjusted cash flows discounted at rates considered appropriate given the inherent risks associated with each type of asset. The Company believes the level and timing of cash flows appropriately reflects market participant assumptions.
Revenue Recognition	'
	Revenue Recognition
	The Company recognizes revenue when it is realized or realizable and earned. The Company considers revenue realized or realizable and earned when it has persuasive evidence of an arrangement, delivery has occurred, the sales price is fixed or determinable, and collectibility is reasonably assured. Delivery does not occur until the products have been shipped or services provided to the customer, risk of loss has transferred to the customer, and, where applicable, a customer acceptance has been obtained. The sales price is not considered to be fixed or determinable until all material contingencies related to the sales have been resolved. The Company records revenue in the Consolidated Statements of Operations net of any sales, use, value added or certain excise taxes imposed by governmental authorities on specific sales transactions. In addition to the aforementioned general policy, the following are the Company's statements of policy with regard to multiple-element arrangements and specific revenue recognition policies for each major category of revenue.
	Multiple-Element Arrangements. The Company commonly enters into revenue arrangements that include multiple deliverables of its product and service offerings due to the needs of its customers. Products may be delivered in phases over time periods which can be as long as five years. Maintenance services generally begin upon acceptance of the first equipment delivery and future deliveries of equipment generally have an associated maintenance period. The Company considers the maintenance period to commence upon acceptance of the product or installation in situations where a formal acceptance is not required, which may include a warranty period and accordingly allocates a portion of the arrangement consideration as a separate deliverable which is recognized as service revenue over the entire service period. Other services such as training and engineering services can be delivered as a discrete delivery or over the term of the contract. A multiple-element arrangement is separated into more than one unit of accounting if the following criteria are met:
	•	The delivered item(s) has value to the customer on a standalone basis; and
	•	If the arrangement includes a general right of return relative to the delivered item(s), delivery or performance of the undelivered item(s) is considered probable and substantially in the control of the Company.
	If these criteria are met for each element, the arrangement consideration is allocated to the separate units of accounting based on each unit's relative selling price. If these criteria are not met, the arrangement is accounted for as one unit of accounting which would result in revenue being recognized ratably over the contract term or being deferred until the earlier of when such criteria are met or when the last undelivered element is delivered.
	The Company follows a selling price hierarchy in determining the best estimate of the selling price of each deliverable. Certain products and services are sold separately in standalone arrangements for which the Company is sometimes able to determine vendor specific objective evidence, or VSOE. The Company determines VSOE based on normal pricing and discounting practices for the product or service when sold separately.
	When the Company is not able to establish VSOE for all deliverables in an arrangement with multiple elements, the Company attempts to establish the selling price of each remaining element based on third-party evidence, or TPE. The Company's inability to establish VSOE is often due to a relatively small sample of customer contracts that differ in system size and contract terms which can be due to infrequently selling each element separately, not pricing products within a narrow range, or only having a limited sales history, such as in the case of certain advanced and emerging technologies. TPE is determined based on the Company's prices or competitor prices for similar deliverables when sold separately. However, the Company is often unable to determine TPE, as the Company's offerings contain a significant level of customization and differentiation from those of competitors and the Company is often unable to reliably determine what similar competitor products' selling prices are on a standalone basis.
	When the Company is unable to establish selling price using VSOE or TPE, the Company uses estimated selling price, or ESP, in its allocation of arrangement consideration. The objective of ESP is to determine the price at which the Company would transact a sale if the product or service were sold on a standalone basis. In determining ESP, the Company uses the cost to provide the product or service plus a margin, or consider other factors. When using cost plus a margin, the Company considers the total cost of the product or service, including customer-specific and geographic factors. The Company also considers the historical margins of the product or service on previous contracts and several factors including any changes to pricing methodologies, competitiveness of products and services and cost drivers that would cause future margins to differ from historical margins.
	Products. The Company most often recognizes revenue from sales of products upon customer acceptance of the system. Where formal acceptance is not required, the Company recognizes revenue upon delivery or installation. When the product is part of a multiple element arrangement, the Company allocates a portion of the arrangement consideration to product revenue based on estimates of selling price.
	Services. Maintenance services are provided under separate maintenance contracts with customers. These contracts generally provide for maintenance services for one year, although some are for multi-year periods, often with prepayments for the term of the contract. The Company considers the maintenance period to commence upon acceptance of the product or installation in situations where a formal acceptance is not required, which may include a warranty period. When service is part of a multiple element arrangement, the Company allocates a portion of the arrangement consideration to maintenance service revenue based on estimates of selling price. Maintenance contracts that are billed in advance of revenue recognition are recorded as deferred revenue. Maintenance revenue is recognized ratably over the term of the maintenance contract.
	Revenue from engineering services is recognized as services are performed.
	Project Revenue. Revenue from design and build contracts is recognized under the percentage-of-completion (or POC method). Under the POC method, revenue is recognized based on the costs incurred to date as a percentage of the total estimated costs to fulfill the contract. If circumstances arise that change the original estimates of revenues, costs, or extent of progress toward completion, revisions to the estimates are made. These revisions may result in increases or decreases in estimated revenues or costs, and such revisions are recorded in income in the period in which the circumstances that gave rise to the revision become known by management. The Company performs ongoing profitability analyses of its contracts accounted for under the POC method in order to determine whether the latest estimates of revenue, costs and extent of progress require updating. If at any time these estimates indicate that the contract will be unprofitable, the entire estimated loss for the remainder of the contract is recorded immediately.
	The Company records revenue from certain research and development contracts which include milestones using the milestone method if the milestones are determined to be substantive. A milestone is considered to be substantive if management believes there is substantive uncertainty that it will be achieved and the milestone consideration meets all of the following criteria:
	•	It is commensurate with either of the following:
	•	The Company's performance to achieve the milestone; or
	•	The enhancement of value of the delivered item or items as a result of a specific outcome resulting from the Company's performance to achieve the milestone.
	•	It relates solely to past performance.
	•	It is reasonable relative to all of the deliverables and payment terms (including other potential milestone consideration) within the arrangement.
	The individual milestones are determined to be substantive or non-substantive in their entirety and milestone consideration is not bifurcated.
	Revenue from projects is classified as Product Revenue or Service Revenue, based on the nature of the work performed.
	Nonmonetary Transactions. The Company values and records nonmonetary transactions at the fair value of the asset surrendered unless the fair value of the asset received is more clearly evident, in which case the fair value of the asset received is used.
Foreign Currency Transaction	'
	Foreign Currency Translation
	The Company uses the U.S. dollar predominantly as its functional currency. Assets and liabilities of foreign subsidiaries that have a functional currency denominated in non-U.S. dollars are translated into U.S. dollars at year-end exchange rates, and revenue and expenses of these foreign subsidiaries are translated at average rates prevailing during the year. Translation adjustments are included in “Accumulated other comprehensive income,” a separate component of shareholders’ equity. Transaction gains and losses arising from transactions denominated in a currency other than the functional currency of the entity involved are included in “Other (income) expense, net” in the accompanying Consolidated Statements of Operations. Net transaction losses were $1.3 million, $0.1 million, and $1.3 million for 2013, 2012, and 2011, respectively.
Research and Development	'
	Research and Development
	Research and development expenses include costs incurred in the development and production of hardware and software, costs incurred to enhance and support existing product features, costs incurred to support and improve development processes, and costs related to future product development. Research and development costs are expensed as incurred, and may be offset by co-funding from third parties. The Company may also enter into arrangements whereby it makes advance, non-refundable payments to a vendor to perform certain research and development services. These payments are deferred and recognized over the vendor’s estimated performance period. During the third quarter of 2009, the Company amended a vendor agreement to settle outstanding performance issues. The Company had made advance payments of $16.2 million to the vendor. Due to the amendment, the Company received a refund of $10.0 million of amounts previously paid to the vendor and the right to receive rebates on future purchases. The Company estimated the fair value of this rebate right to be $6.2 million. The Company believes the rebate right is recoverable and it has been classified in “Other non-current assets” in the Consolidated Balance Sheets. No gain or loss was recorded as a result of this amendment. As of December 31, 2013, $2.8 million in rebates remain available for use.
	Amounts to be received under co-funding arrangements with the U.S. government or other customers are based on either contractual milestones or costs incurred. These co-funding milestone payments are recognized in operations as performance is estimated to be completed and are measured as milestone achievements occur or as costs are incurred. These estimates are reviewed on a periodic basis and are subject to change, including in the near term. If an estimate is changed, net research and development expense could be impacted significantly.
	The Company does not record a receivable from the U.S. government prior to completing the requirements necessary to bill for a milestone or cost reimbursement. Funding from the U.S. government is subject to certain budget restrictions and milestones may be subject to completion risk, and as a result, there may be periods in which research and development costs are expensed as incurred for which no reimbursement is recorded, as milestones have not been completed or the U.S. government has not funded an agreement. Accordingly, there can be substantial variability in the amount of net research and development expenses from quarter to quarter and year to year.
	The Company classifies amounts to be received from funded research and development projects as either revenue or a reduction to research and development expense based on the specific facts and circumstances of the contractual arrangement, considering total costs expected to be incurred compared to total expected funding and the nature of the research and development contractual arrangement. In the event that a particular arrangement is determined to represent revenue, the corresponding research and development costs are classified as cost of revenue.
Income Taxes	'
	Income Taxes
	Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and operating loss and tax credit carryforwards and are measured using the enacted tax rates and laws that will be in effect when the differences and carryforwards are expected to be recovered or settled. A valuation allowance for deferred tax assets is provided when the Company estimates that it is more likely than not that all or a portion of the deferred tax assets may not be realized through future operations. This assessment is based upon consideration of available positive and negative evidence, which includes, among other things, recent results of operations and expected future profitability. The Company considers its actual historical results over several years to have stronger weight than other more subjective indicators, including forecasts, when considering whether to establish or reduce a valuation allowance on deferred tax assets.
	The Company recognizes the income tax benefit from a tax position only if it is more likely than not that the tax position will be sustained on examination by the applicable taxing authorities, based on the technical merits of the Company’s position. The tax benefit recognized in the financial statements from such a position is measured based on the largest benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement.
	Estimated interest and penalties are recorded as a component of interest expense and other expense, respectively.
	As of December 31, 2013, the Company had approximately $106.2 million of net deferred tax assets, against which the Company provided a $77.8 million valuation allowance, resulting in a net deferred tax asset of $28.4 million. During the year ended December 31, 2013 the Company reduced the valuation allowance held against its deferred tax assets by $13.5 million due to actual income from operations during the year ended December 31, 2013 exceeding amounts previously used in the evaluation of the realizability of the Company's deferred tax assets at the beginning of the year and based upon an assessment of all positive and negative evidence relating to future years. The Company considers its actual historical results over several years to have stronger weight than other more subjective indicators when considering whether to establish or reduce a valuation allowance on deferred tax assets. The Company continues to provide a partial valuation allowance against its U.S. deferred tax assets and a full valuation allowance against deferred tax assets arising in a limited number of foreign jurisdictions as the realization of such assets is not considered to be more likely than not at this time. In a future period the Company’s assessment of the realizability of its deferred tax assets and therefore the appropriateness of the valuation allowance could change based on an assessment of all available evidence, both positive and negative in that future period. If the Company’s conclusion about the realizability of its deferred tax assets and therefore the appropriateness of the valuation allowance changes in a future period, the Company could record a substantial tax provision or benefit in its Consolidated Statement of Operations when that occurs.
Share-based Compensation	'
	Share-Based Compensation
	The Company measures compensation cost for share-based payment awards at fair value and recognizes it as compensation expense over the service period for awards expected to vest. Share-based compensation expense is recognized for all share-based payment awards, net of an estimated forfeiture rate. Compensation cost is only recognized for those shares expected to vest on a straight-line basis over the requisite service period of the award.
	Determining the appropriate fair value model and calculating the fair value of share-based payment awards requires subjective assumptions, including the expected life of the share-based payment awards and stock price volatility. The Company utilizes the Black-Scholes options pricing model to value the stock options granted under its options plans. In this model, the assumptions utilized relate to stock price volatility, stock option term and forfeiture rates that are based upon both historical factors as well as management’s judgment.
	The fair value of restricted stock and restricted stock units is determined based on the number of shares or units granted and the quoted price of the Company's common stock at the date of grant.
	The Company grants performance vesting restricted shares to executives as one of the ways to align compensation with shareholder interests. Vesting of these awards is contingent upon achievement of certain performance conditions. Compensation expense for these awards is only recorded when vesting is deemed to be probable.
Shipping and Handling Costs	'
	Shipping and Handling Costs
	Costs related to shipping and handling are included in “Cost of product revenue” and “Cost of service revenue” in the accompanying Consolidated Statements of Operations.
Advertising Costs	'
	Advertising Costs
	Sales and marketing expenses in the accompanying Consolidated Statements of Operations include advertising expenses of $2.2 million, $1.2 million, and $0.6 million in 2013, 2012, and 2011, respectively. The Company incurs advertising costs for representation at certain trade shows, promotional events and sales lead generation, as well as design and printing costs for promotional materials. The Company expenses all advertising costs as incurred.
Earnings Per Share	'
	Earnings Per Share, or EPS
	Basic EPS is computed by dividing net income available to common shareholders by the weighted average number of common shares, excluding unvested restricted stock outstanding during the period. Diluted EPS is computed by dividing net income available to common shareholders by the weighted average number of common and potential common shares outstanding during the period, which includes the additional dilution related to conversion of stock options, unvested restricted stock and restricted stock units as computed under the treasury stock method. For the years ended December 31, 2013, 2012 and 2011, the added shares from these items included in the calculation of diluted shares and EPS totaled approximately 1.9 million, 1.3 million, and 0.9 million, respectively. Potentially dilutive shares of 0.5 million, 0.4 million, and 2.2 million, respectively, have been excluded from the denominator in the computation of diluted EPS for the years ended December 31, 2013, 2012 and 2011, respectively, because they are antidilutive.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board issued ASU No. 2013-02, Comprehensive Income, or ASU 2013-02. The guidance in ASU 2013-02 requires entities to disclose additional information about reclassification adjustments and significant items reclassified out of accumulated other comprehensive income by component and by respective line items of net income (loss). ASU 2013-02 is effective for fiscal years beginning after December 15, 2012. The Company adopted this guidance on January 1, 2013 and has included all disclosure required by ASU 2013-02.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Schedule of Accumulated Other Comprehensive Income	'
	Accumulated Other Comprehensive Income
	Accumulated other comprehensive income, a component of Shareholders’ equity, consisted of the following at December 31 (in thousands):
			2013				2012				2011
	Accumulated unrealized net loss on available-for-sale investments		$	—			$	(46	)		$	—
	Accumulated currency translation adjustments		3,257				4,301				4,344
	Accumulated unrealized net gain (loss) on cash flow hedges		(2,404		)		926				2,136
	Accumulated other comprehensive income		$	853			$	5,181			$	6,480
	The following tables show the changes in Accumulated Other Comprehensive Income by component for the year ended December 31, 2013 (in thousands):
	Year Ended December 31, 2013
		Unrealized Gain/(Loss) on Investments				Foreign Currency Translation Adjustments				Unrealized Gain/(Loss) on Cash Flow Hedges			Accumulated Other Comprehensive Income
	Beginning balance	$	(46	)		$	4,301			$	926		$	5,181
	Current-period change, net of tax	$	46			$	(1,044	)		$	(3,330	)	$	(4,328	)
	Ending balance	$	—			$	3,257			$	(2,404	)	$	853
	Income tax associated with current-period change	$	31			$	27			$	(2,390	)	$	(2,332	)

Acquisition_Tables

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Schedule of estimated fair values of assets acquired and liabilities assumed	'
	The following are the estimated fair values of the assets acquired and liabilities assumed (in thousands):
	Cash	$	635
	Inventories	7,526
	Other tangible assets	5,702
	Deferred revenue	(2,400		)
	Accounts payable	(2,918		)
	Deferred tax liabilities	(3,685		)
	Other liabilities assumed	(2,061		)
	Net tangible assets	2,799
	Trademarks	300
	Developed technology	5,400
	Customer relationships	1,800
	Non-compete agreements	400
	Goodwill	14,182
	Total net assets acquired	$	24,881
Schedule of fair value of major components of intangible assets acquired and estimated useful lives	'
	The fair values of the major components of the intangible assets acquired and their estimated useful lives are as follows (in thousands):
							Useful Life
	Intangible Asset Class		Fair Value				(in Years)
	Trademarks		$	300			5
	Developed technology		$	5,400			3
	Customer relationships		$	1,800			10
	Non-compete agreements		$	400			2
Schedule of unaudited pro forma condensed financial information	'
	The following unaudited pro forma condensed financial information presents the combined results of operations of the Company and Appro as if the acquisition had occurred on January 1, 2011 (in thousands):
		Year Ended December 31,
		2012				2011
	Revenue	$	494,369			$	291,409
	Net income	$	161,985			$	10,487
Schedule of carrying amount of purchased intangibles	'
	The carrying amount of purchased intangibles at December 31, 2013 was as follows (in thousands):
		31-Dec-13
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Trademarks	$	300		$	67		$	233
	Developed technology	5,400			2,000			3,400
	Customer relationships	1,800			200			1,600
	Non-compete agreements	400			222			178
	Total	$	7,900		$	2,489		$	5,411
	The carrying amount of purchased intangibles at December 31, 2012 was as follows (in thousands):
		31-Dec-12
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Trademarks	$	300		$	7		$	293
	Developed technology	5,400			200			5,200
	Customer relationships	1,800			20			1,780
	Non-compete agreements	400			22			378
	Total	$	7,900		$	249		$	7,651
Schedule of amortization expense	'
	Aggregate estimated amortization expense for the years ending December 31 are as follows (in thousands):
	2014	$	2,218
	2015	1,840
	2016	240
	2017	233
	2018	180
		$	4,711

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Company's financial assets and liabilities measured at fair value and the hierarchy of the valuation inputs	'
	The following table presents information about the Company’s financial assets and liabilities that have been measured at fair value on a recurring basis as of December 31, 2013 and 2012, and indicates the fair value hierarchy of the valuation inputs utilized to determine such fair value (in thousands):
	Description		Fair Value		Quoted		Significant
			as of		Prices in		Other
			December 31,		Active		Observable
			2013		Markets		Inputs
					(Level 1)		(Level 2)
	Assets:
	Cash, cash equivalents and restricted cash		$	206,401	$	206,401	$	—
	Short-term investments		14,048		14,048		—
	Foreign exchange forward contracts (2)		1,730		—		1,730
	Assets measured at fair value at December 31, 2013		$	222,179	$	220,449	$	1,730
	Liabilities:
	Foreign exchange forward contracts (3)		7,237		—		7,237
	Liabilities measured at fair value at December 31, 2013		$	7,237	$	—	$	7,237
	Description		Fair Value		Quoted		Significant
			as of		Prices in		Other
			December 31,		Active		Observable
			2012		Markets		Inputs
					(Level 1)		(Level 2)
	Assets:
	Cash, cash equivalents and restricted cash		$	253,065	$	253,065	$	—
	Available for sale investments (1)		70,140		70,140		—
	Foreign exchange forward contracts (2)		1,101		—		1,101
	Assets measured at fair value at December 31, 2012		$	324,306	$	323,205	$	1,101
	Liabilities:
	Foreign exchange forward contracts (3)		651		—		651
	Liabilities measured at fair value at December 31, 2012		$	651	$	—	$	651
	_______________________________
	-1	Included in "Short-term investments" and "Long-term investments" on the Company's Consolidated Balance Sheets.
	-2	Included in “Prepaid expenses and other current assets” and “Other non-current assets” on the Company’s Consolidated Balance Sheets.
	-3	Included in “Other accrued liabilities” and “Other non-current liabilities” on the Company’s Consolidated Balance Sheets.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income/(Loss) (Tables)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income/(Loss) [Abstract]	'
Reclassification from Accumulated Other Comprehensive Income	'
	The following table shows the gross and net of tax reclassification adjustments from accumulated other comprehensive income resulting from hedged foreign currency transactions recorded by the Company for the years ended December 31, 2013, 2012 and 2011 (in thousands). The gross reclassification adjustments decreased product revenue for the year ended December 31, 2013 and increased product revenue for the years ended December 31, 2012 and 2011, respectively.
			Year Ended
			December 31,
			2013				2012				2011
	Gross of Tax Reclassifications		$	(1,604	)		$	643			$	443
	Net of Tax Reclassifications		$	(962	)		$	386			$	266
Schedule of Accumulated Other Comprehensive Income	'
	Accumulated Other Comprehensive Income
	Accumulated other comprehensive income, a component of Shareholders’ equity, consisted of the following at December 31 (in thousands):
			2013				2012				2011
	Accumulated unrealized net loss on available-for-sale investments		$	—			$	(46	)		$	—
	Accumulated currency translation adjustments		3,257				4,301				4,344
	Accumulated unrealized net gain (loss) on cash flow hedges		(2,404		)		926				2,136
	Accumulated other comprehensive income		$	853			$	5,181			$	6,480
	The following tables show the changes in Accumulated Other Comprehensive Income by component for the year ended December 31, 2013 (in thousands):
	Year Ended December 31, 2013
		Unrealized Gain/(Loss) on Investments				Foreign Currency Translation Adjustments				Unrealized Gain/(Loss) on Cash Flow Hedges			Accumulated Other Comprehensive Income
	Beginning balance	$	(46	)		$	4,301			$	926		$	5,181
	Current-period change, net of tax	$	46			$	(1,044	)		$	(3,330	)	$	(4,328	)
	Ending balance	$	—			$	3,257			$	(2,404	)	$	853
	Income tax associated with current-period change	$	31			$	27			$	(2,390	)	$	(2,332	)

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Investments	'
	The carrying amount of the Company's investments in available-for-sale securities as of December 31, 2012 is shown in the table below:
					Unrealized
		Due in	Cost		Gains (Losses)			Fair Value
	Short-term available-for-sale securities	2013	$	52,650	$	(87	)	$	52,563
	Long-term available-for-sale securities	2014	17,567		10			17,577
	Total		$	70,217	$	(77	)	$	70,140

Accounts_and_Other_Receivables1

Accounts and Other Receivables, Net (Tables)	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Accounts and Other Receivables	'
	A summary of net accounts and other receivables follows (in thousands):
		December 31,
		2013			2012
	Trade accounts receivable	$	169,417		$	9,596
	Unbilled receivables	9,075			415
	Advance billings	2,141			278
	Other receivables	2,051			3,156
		182,684			13,445
	Allowance for doubtful accounts	(157		)	(5		)
	Accounts and other receivables, net	$	182,527		$	13,440

Inventory_Tables

Inventory (Tables)	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Inventory	'
	A summary of inventory follows (in thousands):
		31-Dec
		2013		2012
	Components and subassemblies	$	46,339	$	21,865
	Work in process	23,618		11,245
	Finished goods	25,172		56,686
		$	95,129	$	89,796

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Summary of Property and Equipment	'
	A summary of property and equipment follows (in thousands):
		December 31,
		2013			2012
	Land	$	203		$	131
	Buildings	17,022			13,885
	Furniture and equipment	14,443			14,068
	Computer equipment	91,475			80,698
	Leasehold improvements	1,276			420
		124,419			109,202
	Accumulated depreciation and amortization	(94,141		)	(83,659		)
	Property and equipment, net	$	30,278		$	25,543

Service_Inventory_Net_Tables

Service Inventory, Net (Tables)	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Summary of Service Inventory	'
	A summary of service inventory follows (in thousands):
		December 31,
		2013			2012
	Service inventory	$	16,613		$	15,641
	Accumulated depreciation	(14,785		)	(14,151		)
	Service inventory, net	$	1,828		$	1,490

Deferred_Revenue_Tables

Deferred Revenue (Tables)	12 Months Ended
	Dec. 31, 2013
Deferred Revenue Disclosure [Abstract]	'
Deferred revenue	'
	Deferred revenue consisted of the following (in thousands):
		31-Dec
		2013			2012
	Deferred product revenue	$	54,065		$	36,848
	Deferred service revenue	87,900			60,466
	Total deferred revenue	141,965			97,314
	Less long-term deferred revenue	(50,477		)	(29,254		)
	Deferred revenue in current liabilities	$	91,488		$	68,060

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Minimal Contractual Commitments	'
	Minimum contractual commitments as of December 31, 2013, were as follows (in thousands):
		Operating		Development
		Leases		Agreements
	2014	$	4,120	$	4,268
	2015	3,596		217
	2016	3,647		25
	2017	2,991		—
	2018	1,534		—
	Thereafter	2,029		—
	Minimum contractual commitments	$	17,917	$	4,510

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income (loss) before income taxes	'
	Income (loss) before income taxes consisted of the following (in thousands):
			Year Ended December 31,
			2013			2012			2011
	United States		$	17,467		$	161,592		$	(2,847	)
	International		3,562			7,140			2,982
	Total		$	21,029		$	168,732		$	135
Tax provision (benefit) for income taxes related to operations	'
	The tax provision (benefit) for income taxes related to operations consisted of the following (in thousands):
			Year Ended December 31,
			2013			2012			2011
	Current provision (benefit):
	Federal		$	484		$	1,162		$	(106	)
	State		696			2,768			37
	Foreign		801			541			271
	Total current provision		1,981			4,471			202
	Deferred (benefit) provision:
	Federal		(13,160		)	1,362			(12,935		)
	State		(327		)	1,415			(936		)
	Foreign		312			243			(525		)
	Total deferred (benefit) provision		(13,175		)	3,020			(14,396		)
	Total (benefit) provision for income taxes		$	(11,194	)	$	7,491		$	(14,194	)
Tax provision (benefit) differs from the amount computed by applying the federal statutory income tax rate	'
	The tax provision (benefit) differs from the amount computed by applying the federal statutory income tax rate as follows (in thousands):
			Year Ended December 31,
			2013			2012			2011
	Income tax provision at statutory rate		$	7,360		$	59,056		$	47
	State taxes, net of federal benefit		369			4,183			(972		)
	Foreign income taxes		(749		)	(518		)	(406		)
	Stock compensation adjustment		(8,419		)	—			—
	Deemed dividends for U.S. income tax purposes		477			2,352			338
	Nondeductible expenses		208			549			242
	Liquidation of subsidiary		—			(30,704		)	—
	Disallowed compensation		19			492			—
	Research and development tax credit		(5,736		)	—			(1,524		)
	Effect of change in valuation allowance on deferred tax assets		(4,723		)	(27,919		)	(11,919		)
	Effective income tax provision (benefit)		$	(11,194	)	$	7,491		$	(14,194	)
Significant components of the Company's deferred income tax assets and liabilities	'
	Significant components of the Company’s deferred income tax assets and liabilities follow (in thousands):
			December 31,
			2013			2012
	Current:
	Deferred Income Tax Assets
	Inventory		$	3,388		$	5,397
	Accrued compensation		460			912
	Deferred revenue		12,100			6,185
	Net operating loss carryforwards		5,922			3,467
	Other		8,120			1,092
	Gross current deferred tax assets		29,990			17,053
	Valuation allowance		(20,107		)	(13,970		)
	Current deferred tax assets		9,883			3,083
	Deferred Income Tax Liabilities
	Other		(688		)	—
	Current deferred tax liabilities		(688		)	—
	Net current deferred tax assets		$	9,195		$	3,083
	Long-Term:
	Deferred Income Tax Assets
	Property and equipment		$	328		$	411
	Research and experimentation credit carryforwards		23,941			18,301
	Net operating loss carryforwards		47,154			59,039
	Goodwill		628			912
	Other		10,161			5,563
	Gross long-term deferred tax assets		82,212			84,226
	Valuation allowance		(57,687		)	(68,547		)
	Long-term deferred tax assets		24,525			15,679
	Deferred Income Tax Liabilities
	Property and equipment		(1,905		)	(1,363		)
	Intangible assets		(2,059		)	(3,002		)
	Other		(1,355		)	(1,273		)
	Long-term deferred tax liabilities		(5,319		)	(5,638		)
	Net long-term deferred tax asset		$	19,206		$	10,041
Unrecognized tax benefits for uncertain tax positions	'
	The following table summarizes changes in the amount of the Company’s unrecognized tax benefits for uncertain tax positions for the three years ended December 31, 2013 (in thousands):
	Balance at December 31, 2010	$	20
	Lapse of statute of limitations	(20		)
	Balance at December 31, 2011	$	—
	Increase related to current year income tax positions	470
	Balance at December 31, 2012	$	470
	Decrease related to prior year income tax positions	(268		)
	Balance at December 31, 2013	$	202

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]	'
Key weighted average assumptions used in determining the fair value	'
	In determining the fair value of stock options, the Company used the Black-Scholes option pricing model that employed the following key weighted average assumptions:
		2013				2012				2011
	Risk-free interest rate	0.98		%		0.56		%		0.67		%
	Expected dividend yield	—		%		—		%		—		%
	Volatility	50.45		%		74.84		%		74.37		%
	Expected life (in years)	4				4				4
	Weighted average Black-Scholes value of options granted	$	8.22			$	6.56			$	3.34
Stock option activity	'
	A summary of the Company’s stock option activity and related information follows:
		Options			Weighted				Weighted Average Remaining
					Average				Contractual
					Exercise				Term (Years)
					Price
	Outstanding at January 1, 2011	3,445,710			$	6.2
	Granted	476,500			6.08
	Exercised	(248,271	)		4.39
	Canceled and forfeited	(256,019	)		6.65
	Outstanding at December 31, 2011	3,417,920			6.28
	Granted	359,500			11.9
	Exercised	(1,346,326	)		5.52
	Canceled and forfeited	(137,589	)		11.35
	Outstanding at December 31, 2012	2,293,505			7.31
	Granted	346,360			20.65
	Exercised	(495,221	)		6.38
	Canceled and forfeited	(66,575	)		21.97
	Outstanding at December 31, 2013	2,078,069			9.29				7
	Exercisable at December 31, 2013	1,233,951			6.35				5.9
	Available for grant at December 31, 2013	3,171,322
Unvested restricted stock grants and restricted stock units changes	'
	A summary of the Company’s unvested restricted stock and restricted stock unit grants and changes during the years ended December 31 was as follows:
		Shares			Weighted
					Average
					Grant Date
					Fair Value
	Outstanding at January 1, 2011	1,380,491			$	4.77
	Granted	513,587			6.04
	Forfeited	(146,677	)		5.29
	Vested	(444,987	)		4.03
	Outstanding at December 31, 2011	1,302,414			5.47
	Granted	1,316,447			11.99
	Forfeited	(31,771	)		7.64
	Vested	(384,352	)		5.86
	Outstanding at December 31, 2012	2,202,738			9.27
	Granted	755,979			20.93
	Forfeited	(75,437	)		14.48
	Vested	(661,580	)		6.22
	Outstanding at December 31, 2013	2,221,700			13.97
Options outstanding and exercisable	'
	Outstanding and exercisable options by price range as of December 31, 2013, were as follows:
		Outstanding Options									Exercisable Options
	Range of Exercise	Number			Weighted		Weighted				Number		Weighted
	Prices per Share	Outstanding			Average		Average				Exercisable		Average
					Remaining		Exercise						Exercise
					Life (Years)		Price						Price
	$ 0.00 - $ 4.00	348,488			5.3		$	3.72			348,488		$	3.72
	$ 4.01 - $ 6.00	352,269			6.1		$	5.47			296,668		$	5.47
	$ 6.01 - $ 8.00	564,801			6.8		$	6.28			343,010		$	6.4
	$ 8.01 - $ 50.28	812,511			8.3		$	15.42			245,785		$	11.09
	$ 0.00 - $ 50.28	2,078,069			7		$	9.29			1,233,951		$	6.35
Gross share-based compensation cost recorded in the condensed consolidated statements of operations	'
	The following table (in thousands) sets forth the share-based compensation cost resulting from stock options and stock grants recorded in the Company’s Consolidated Statements of Operations for the years ended December 31, 2013, 2012 and 2011.
		2013				2012				2011
	Cost of product revenue	$	135			$	57			$	177
	Cost of service revenue	229				258				369
	Research and development	1,480				1,327				784
	Sales and marketing	2,230				1,717				490
	General and administrative	3,165				2,604				1,808
	Total share-based compensation expense	$	7,239			$	5,963			$	3,628

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Information of operating segments	'
	The following table presents revenues and gross margin for the Company’s operating segments for the years ended December 31 (in thousands):
		2013		2012		2011
	Revenue:
	HPC Systems	$	369,623	$	298,255	$	139,590
	Maintenance and Support	77,842		62,244		62,386
	Storage and Data Management	63,887		50,246		7,197
	Engineering Services and Other	14,397		10,313		26,873
	Total revenue	$	525,749	$	421,058	$	236,046
	Cost of Revenue:
	HPC Systems	$	259,167	$	193,296	$	90,686
	Maintenance and Support	39,233		36,510		31,558
	Storage and Data Management	38,165		35,642		6,557
	Engineering Services and Other	4,858		4,432		12,879
	Total cost of revenue	$	341,423	$	269,880	$	141,680
	Gross Profit:
	HPC Systems	$	110,456	$	104,959	$	48,904
	Maintenance and Support	38,609		25,734		30,828
	Storage and Data Management	25,722		14,604		640
	Engineering Services and Other	9,539		5,881		13,994
	Total gross profit	$	184,326	$	151,178	$	94,366
Revenue by geographic location	'
	Product and service revenue and long-lived assets classified by significant country were as follows (in thousands):
		United		All		Total
		States		Other
				Countries
	For the year ended December 31, 2013:
	Product revenue	$	297,583	$	138,747	$	436,330
	Service revenue	$	62,072	$	27,347	$	89,419
	Long-lived assets	$	58,910	$	6,146	$	65,056
	For the year ended December 31, 2012:
	Product revenue	$	301,162	$	52,605	$	353,767
	Service revenue	$	42,359	$	24,932	$	67,291
	Long-lived assets	$	57,549	$	4,460	$	62,009
	For the year ended December 31, 2011:
	Product revenue	$	95,929	$	59,632	$	155,561
	Service revenue	$	56,660	$	23,825	$	80,485
	Long-lived assets	$	28,281	$	4,085	$	32,366

Research_and_Development_Table

Research and Development (Tables)	12 Months Ended
	Dec. 31, 2013
Research and Development [Abstract]	'
Company's Net Research and Development Cost	'
	The detail for the Company’s net research and development costs for the years ended December 31 follows (in thousands):
		2013			2012			2011
	Gross research and development expenses	$	92,469		$	86,305		$	76,993
	Less: Amounts included in cost of revenue	(3,741		)	(1,080		)	(410		)
	Less: Reimbursed research and development (excludes amounts in revenue)	(1,000		)	(20,922		)	(27,131		)
	Net research and development expenses	$	87,728		$	64,303		$	49,452

Interest_Income_Expense_Tables

Interest Income (Expense) (Tables)	12 Months Ended
	Dec. 31, 2013
Other Income and Expenses [Abstract]	'
The detail of interest income (expense) for the years ended	'
	The detail of interest income (expense) for the years ended December 31 follows (in thousands):
		2013			2012			2011
	Interest income	$	894		$	397		$	229
	Interest expense	(137		)	(193		)	(262		)
	Net interest income (expense)	$	757		$	204		$	(33	)

Quarterly_Data_Unaudited_Table

Quarterly Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information	'
		2013											2012
	For the Quarter Ended	31-Mar			30-Jun			30-Sep			31-Dec		31-Mar		30-Jun		30-Sep			31-Dec
	Revenue	$	79,547		$	84,467		$	54,366		$	307,369	$	112,307	$	84,183	$	35,739		$	188,829
	Cost of revenue	55,397			57,666			33,940			194,420		67,151		49,688		18,407			134,634
	Gross profit	24,150			26,801			20,426			112,949		45,156		34,495		17,332			54,195
	Research and development, net	20,226			19,968			21,555			25,979		23,750		6,893		15,483			18,177
	Sales and marketing	11,143			11,550			11,480			17,172		7,873		10,233		6,495			12,579
	General and administrative	5,485			5,085			4,970			8,063		5,130		4,971		3,324			7,282
	Net income (loss)	(7,609		)	(150		)	(11,025		)	51,007		4,964		147,422		(5,151		)	14,006
	Net income (loss) per common share, basic	$	(0.20	)	$	—		$	(0.29	)	$	1.33	$	0.14	$	4.05	$	(0.14	)	$	0.38
	Net income (loss) per common share, diluted	$	(0.20	)	$	—		$	(0.29	)	$	1.27	$	0.13	$	3.9	$	(0.14	)	$	0.36

Acquisition_Details

Acquisition (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Nov. 21, 2012	Nov. 21, 2012	Nov. 21, 2012	Nov. 21, 2012	Nov. 21, 2012
			Appro International, Inc.	Developed technology	Customer relationships	Non-compete agreements	Trademarks
				Appro International, Inc.	Appro International, Inc.	Appro International, Inc.	Appro International, Inc.
Business Acquisition [Line Items]	'	'	'	'	'	'	'
Consideration transferred	'	'	$24,900,000	'	'	'	'
Cash	'	'	635,000	'	'	'	'
Inventories	'	'	7,526,000	'	'	'	'
Other tangible assets	'	'	5,702,000	'	'	'	'
Deferred revenue	'	'	-2,400,000	'	'	'	'
Accounts payable	'	'	-2,918,000	'	'	'	'
Deferred tax liabilities	'	'	-3,685,000	'	'	'	'
Other liabilities assumed	'	'	-2,061,000	'	'	'	'
Net tangible assets	'	'	2,799,000	'	'	'	'
Intangibles, excluding goodwill	'	'	'	5,400,000	1,800,000	400,000	300,000
Goodwill	14,182,000	14,182,000	14,182,000	'	'	'	'
Total net assets acquired	'	'	$24,881,000	'	'	'	'

Acquisition_Intangible_Assets_

Acquisition Intangible Assets by Class (Details) (Appro International, Inc., USD $)	0 Months Ended
In Thousands, unless otherwise specified	Nov. 21, 2012
Developed technology	'
Finite-Lived and Indefinite-Lived Assets Acquired as Part of Business Combination [Line Items]	'
Fair Value	$5,400
Useful Life (Years)	'3 years
Customer relationships	'
Finite-Lived and Indefinite-Lived Assets Acquired as Part of Business Combination [Line Items]	'
Fair Value	1,800
Useful Life (Years)	'10 years
Non-compete agreements	'
Finite-Lived and Indefinite-Lived Assets Acquired as Part of Business Combination [Line Items]	'
Fair Value	400
Useful Life (Years)	'2 years
Trademarks	'
Finite-Lived and Indefinite-Lived Assets Acquired as Part of Business Combination [Line Items]	'
Fair Value	$300
Useful Life (Years)	'5 years

Acquisition_Acquisition_Pro_Fo

Acquisition Acquisition, Pro Forma Information (Details) (Appro International, Inc., USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Appro International, Inc.	'	'	'
Business Acquisition [Line Items]	'	'	'
Revenue since Acquisition Date, Actual	$600,000	'	'
Loss since Acquisition Date, Actual	1,300,000	'	'
Acquisition related costs	900,000	'	'
Revenue	'	494,369,000	291,409,000
Net income	'	$161,985,000	$10,487,000

Acquisition_Carrying_Amount_Ne

Acquisition Carrying Amount, Net, of Amortizable Intangible Assets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Net Carrying Amount	$6,362	$7,981
Appro International, Inc.	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	7,900	7,900
Accumulated Amortization	2,489	249
Net Carrying Amount	5,411	7,651
Appro International, Inc. | Trademarks	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	300	300
Accumulated Amortization	67	7
Net Carrying Amount	233	293
Appro International, Inc. | Developed technology	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	5,400	5,400
Accumulated Amortization	2,000	200
Net Carrying Amount	3,400	5,200
Appro International, Inc. | Customer relationships	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	1,800	1,800
Accumulated Amortization	200	20
Net Carrying Amount	1,600	1,780
Appro International, Inc. | Non-compete agreements	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	400	400
Accumulated Amortization	222	22
Net Carrying Amount	$178	$378

Acquisition_Future_Amortizatio

Acquisition Future Amortization Expense (Details) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013
Business Acquisition [Line Items]	'	'
2014	'	$2,218,000
2015	'	1,840,000
2016	'	240,000
2017	'	233,000
2018	'	180,000
Future amortization expense	'	4,711,000
Appro International, Inc.	'	'
Business Acquisition [Line Items]	'	'
Amortization expense related to purchased intangibles	$200,000	$2,200,000

Summary_of_Significant_Account3

Summary of Significant Accounting Policies Cash, Cash Equivalents and Restricted Cash (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Long-term restricted cash	$13,768	$0
Long-term investments, expected term	'1 year	'
Line of Credit	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Long-term restricted cash	$13,800	'
Minimum	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Short term investments, expected term	'3 months	'
Maximum	'	'
Restricted Cash and Cash Equivalents Items [Line Items]	'	'
Short term investments, expected term	'1 year	'

Summary_of_Significant_Account4

Summary of Significant Accounting Policies Property and Equipment and Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2013
Minimum	'
Property, Plant and Equpment and Intangible Assets [Line Items]	'
Useful Life (Years)	'2 years
Maximum	'
Property, Plant and Equpment and Intangible Assets [Line Items]	'
Useful Life (Years)	'10 years
Furniture and Fixtures | Minimum	'
Property, Plant and Equpment and Intangible Assets [Line Items]	'
Property and equipment, useful lives (years)	'P18M
Furniture and Fixtures | Maximum	'
Property, Plant and Equpment and Intangible Assets [Line Items]	'
Property and equipment, useful lives (years)	'P7Y
Computer equipment	'
Property, Plant and Equpment and Intangible Assets [Line Items]	'
Property and equipment, useful lives (years)	'P3Y
Building and Building Improvements | Minimum	'
Property, Plant and Equpment and Intangible Assets [Line Items]	'
Property and equipment, useful lives (years)	'P8Y
Building and Building Improvements | Maximum	'
Property, Plant and Equpment and Intangible Assets [Line Items]	'
Property and equipment, useful lives (years)	'P25Y

Summary_of_Significant_Account5

Summary of Significant Accounting Policies Service Inventory (Details)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Service Inventory, Useful Life	'4 years

Summary_of_Significant_Account6

Summary of Significant Accounting Policies Foreign Currency Translation and Transaction (Details) (Other (Income) Expense, Net, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other (Income) Expense, Net	'	'	'
Foreign Currency Translations and Transactions [Line Items]	'	'	'
Net transaction losses	($1.30)	($0.10)	($1.30)

Summary_of_Significant_Account7

Summary of Significant Accounting Policies Research and Development (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2009	Dec. 31, 2012
Accounting Policies [Abstract]	'	'
Advance payments	$16.20	'
Amount of refund	10	'
Estimated fair value of rebate right	6.2	'
Amount of rebates that remain available for use	'	$2.80

Summary_of_Significant_Account8

Summary of Significant Accounting Policies Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance [Line Items]	'	'	'
Net deferred tax assets	$106,200,000	'	'
Valuation allowance amount	-77,800,000	'	'
Net deferred tax assets of valuation allowance	28,400,000	'	'
Change in amount of deferred tax assets	4,700,000	-27,900,000	17,500,000
Valuation Allowance, Operating Loss Carryforwards	'	'	'
Valuation Allowance [Line Items]	'	'	'
Change in amount of deferred tax assets	$13,500,000	'	'

Summary_of_Significant_Account9

Summary of Significant Accounting Policies Advertising Costs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Advertising expenses	$2.20	$1.20	$0.60

Recovered_Sheet1

Summary of Significant Accounting Policies EPS (Details)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Shares added from these items included in the calculation of diluted shares and EPS	1.9	1.3	0.9
Potentially dilutive shares excluded from the denominator in the computation of diluted EPS	0.5	0.4	2.2

Recovered_Sheet2

Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax	$853	$5,181	$6,480
Accumulated unrealized net loss on available-for-sale investments	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax	0	-46	0
Accumulated currency translation adjustments	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,257	4,301	4,344
Accumulated other comprehensive income	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated Other Comprehensive Income (Loss), Net of Tax	($2,404)	$926	$2,136

Sale_of_Interconnect_Hardware_1

Sale of Interconnect Hardware Development Program (Details) (USD $)	0 Months Ended	12 Months Ended
	2-May-12	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Employee
Sale of Interconnect Hardware Development Program [Abstract]	'	'	'	'
Sale of interconnect hardware development program	$140,000,000	'	'	'
Number of employees joined Intel as part of transaction	73	'	'	'
Net Gain on sale of Interconnect Hardware Development Program	$139,100,000	$0	$139,068,000	$0

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'		'
Cash, cash equivalents and restricted cash	$206,401		$253,065
Available for sale investments	14,048		70,140	[1]
Foreign exchange forward contracts	1,730	[2]	1,101	[2]
Assets measured at fair value at December	222,179		324,306
Liabilities:	'		'
Foreign exchange forward contracts	7,237	[3]	651	[3]
Liabilities measured at fair value at December	7,237		651
Quoted Prices in Active Markets (Level 1)	'		'
Assets:	'		'
Cash, cash equivalents and restricted cash	206,401		253,065
Available for sale investments	14,048		70,140	[1]
Foreign exchange forward contracts	0	[2]	0	[2]
Assets measured at fair value at December	220,449		323,205
Liabilities:	'		'
Foreign exchange forward contracts	0	[3]	0	[3]
Liabilities measured at fair value at December	0		0
Significant Other Observable Inputs (Level 2)	'		'
Assets:	'		'
Cash, cash equivalents and restricted cash	0		0
Available for sale investments	0		0	[1]
Foreign exchange forward contracts	1,730	[2]	1,101	[2]
Assets measured at fair value at December	1,730		1,101
Liabilities:	'		'
Foreign exchange forward contracts	7,237	[3]	651	[3]
Liabilities measured at fair value at December	$7,237		$651
[1]	Included in "Short-term investments" and "Long-term investments" on the Company's Consolidated Balance Sheets.
[2]	Included in “Prepaid expenses and other current assets” and “Other non-current assets” on the Company’s Consolidated Balance Sheets.
[3]	Included in “Other accrued liabilities” and “Other non-current liabilities” on the Company’s Consolidated Balance Sheets.

Fair_Value_Measurements_Textua

Fair Value Measurements Textuals (Details)

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

USD ($)

CAD

CHF

EUR (€)

GBP (£)

JPY (¥)

SGD

USD ($)

EUR (€)

JPY (¥)

Foreign Exchange Forward

Foreign Exchange Forward

USD ($)

USD ($)

Fair Value Measurement (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding notional amounts, forward contracts

'

0

0

€ 53,000,000

£ 36,400,000

¥ 1,200,000,000

0

'

€ 57,500,000

¥ 277,900,000

'

'

Hedged foreign currency exposure

151,400,000

'

'

'

'

'

'

79,300,000

'

'

'

'

Fair value of outstanding forward contracts

'

'

'

'

'

'

'

'

'

'

-5,500,000

500,000

Foreign currency gains

$3,257,000

'

'

'

'

'

'

$4,301,000

'

'

($2,400,000)

$900,000

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income/(Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income/(Loss) [Abstract]	'	'	'
Gross of Tax Reclassifications	$1,604	($643)	($443)
Net of Tax Reclassifications	-962	386	266
Unrealized Gain/ (Loss) on Investments Beginning balance	-46	'	'
Unrealized Gain/ (Loss) on Investments, Current-period change, net of tax	46	'	'
Unrealized Gain/ (Loss) on Investments Beginning balance	0	-46	'
Foreign Currency Translation Adjustments, Beginning Balance	4,301	'	'
Foreign Currency Translation Adjustments, Current-period change, net of tax	-1,044	'	'
Foreign Currency Translation Adjustments, Ending Balance	3,257	4,301	'
Unrealized Gain/ (Loss) on Cash Flow Hedges, Beginning Balance	926	'	'
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-3,330	'	'
Unrealized Gain/ (Loss) on Cash Flow Hedges, Ending Balance	-2,404	926	'
Accumulated Other Comprehensive Income, Beginning Balance	5,181	6,480	'
Accumulated Other Comprehensive Income, Current-period change, net of tax	-4,328	'	'
Accumulated Other Comprehensive Income, Ending Balance	853	5,181	6,480
Unrealized Gain/ (Loss) on Investments, Income tax associated with current-period change	31	'	'
Foreign Currency Translation Adjustments, Income tax associated with current-period change	27	'	'
Unrealized Gain/ (Loss) on Cash Flow Hedges, Income tax associated with current-period change	-2,390	'	'
Accumulated Other Comprehensive Income, Income tax associated with current-period change	($2,332)	'	'

Investments_Schedule_of_Availa

Investments Schedule of Available-for-Sale-Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Cost	$14,048	$70,217
Unrealized Gains (Losses)	0	-77
Fair Value	14,048	70,140	[1]
Short-term available-for-sale securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Cost	14,048	52,650
Unrealized Gains (Losses)	0	-87
Fair Value	14,048	52,563
Long-term available-for-sale securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Cost	'	17,567
Unrealized Gains (Losses)	'	10
Fair Value	'	$17,577
[1]	Included in "Short-term investments" and "Long-term investments" on the Company's Consolidated Balance Sheets.

Accounts_and_Other_Receivables2

Accounts and Other Receivables, Net (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Net accounts and other receivables	'	'
Accounts and other receivables, gross	$182,684	$13,445
Allowance for doubtful accounts	-157	-5
Accounts and other receivables, net	182,527	13,440
Unbilled receivables	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	9,075	415
Trade accounts receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	169,417	9,596
Advance billings	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	2,141	278
Other receivables	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	$2,051	$3,156

Accounts_and_Other_Receivables3

Accounts and Other Receivables, Net Textuals (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
US. government agencies and customers	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	$111,900	$5,100
Non US government customers | Accounts Receivable	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Number of customer accounted for total deferred revenue	0	'
Non-U.S. government customers accounted, percentage	10.00%	'
Unbilled receivables	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	9,075	415
Unbilled receivables | US. government agencies and customers	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Accounts receivable	$300	$100

Inventory_Details

Inventory (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Components and subassemblies	$46,339	$21,865
Work in process	23,618	11,245
Finished goods	25,172	56,686
Total	$95,129	$89,796

Inventory_Textuals_Details

Inventory Textuals (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Concentration Risk [Line Items]	'	'	'
Finished goods inventory located at customer sites, value	$24,800,000	$56,100,000	'
Customers accounted of finished goods	18,000,000	35,900,000	'
Inventory , written off	917,000	2,329,000	0
Finished Goods Inventory	'	'	'
Concentration Risk [Line Items]	'	'	'
Number of customer accounted for finished goods inventory	1	2	'
Cray XE, Cray XK, and CCS Product Lines	'	'	'
Concentration Risk [Line Items]	'	'	'
Inventory , written off	$900,000	$2,300,000	$0

Property_and_Equipment_Net_Det

Property and Equipment, Net (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	$124,419,000	$109,202,000	'
Accumulated depreciation and amortization	-94,141,000	-83,659,000	'
Property and equipment, net	30,278,000	25,543,000	'
Depreciation, Depletion and Amortization [Abstract]	'	'	'
Depreciation	10,900,000	7,400,000	7,600,000
Land	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	203,000	131,000	'
Buildings	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	17,022,000	13,885,000	'
Furniture and equipment	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	14,443,000	14,068,000	'
Computer equipment	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	91,475,000	80,698,000	'
Leasehold improvements	'	'	'
Property, Plant and Equipment [Line Items]	'	'	'
Property, Plant and Equipment, Gross	$1,276,000	$420,000	'

Service_Inventory_Net_Details

Service Inventory, Net (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Service inventory	$16,613	$15,641
Accumulated depreciation	-14,785	-14,151
Service inventory, net	$1,828	$1,490

Deferred_Revenue_Details

Deferred Revenue (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Revenue Arrangement [Line Items]	'	'
Total deferred revenue	$141,965	$97,314
Less long-term deferred revenue	-50,477	-29,254
Deferred revenue	91,488	68,060
Deferred product revenue	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Total deferred revenue	54,065	36,848
Deferred service revenue	'	'
Deferred Revenue Arrangement [Line Items]	'	'
Total deferred revenue	$87,900	$60,466

Deferred_Revenue_Textual_Detai

Deferred Revenue Textual (Details) (Revenue)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]	'	'
Number of customer accounted for total deferred revenue	3	4
Customer Concentration Risk	'	'
Concentration Risk [Line Items]	'	'
Percentage of deferred revenue	47.00%	62.00%

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Commitments [Line Items]	'	'	'
Rent expense	$5,300,000	$4,600,000	$4,900,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'	'	'
Operating Leases, 2014	4,120,000	'	'
Operating Leases, 2015	3,596,000	'	'
Operating Leases, 2016	3,647,000	'	'
Operating Leases, 2017	2,991,000	'	'
Operating Leases, 2018	1,534,000	'	'
Operating Leases, Thereafter	2,029,000	'	'
Operating Leases, Minimum Contractual Commitments	17,917,000	'	'
Other Commitment, Fiscal Year Maturity [Abstract]	'	'	'
Research and development, net	87,728,000	64,303,000	49,452,000
Development Agreements	'	'	'
Other Commitment, Fiscal Year Maturity [Abstract]	'	'	'
Development Agreements, 2014	'	4,268,000	'
Development Agreements, 2015	'	217,000	'
Development Agreements, 2016	'	25,000	'
Development Agreements, 2017	'	0	'
Development Agreements, 2018	'	0	'
Development Agreements, Thereafter	'	0	'
Other Commitment	'	4,510,000	'
Research and development, net	$9,300,000	$4,900,000	$4,700,000

Income_Taxes_Narrative_Details

Income Taxes Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]	'	'	'
United States	$17,467,000	$161,592,000	($2,847,000)
International	3,562,000	7,140,000	2,982,000
Income before income taxes	21,029,000	168,732,000	135,000
Income tax benefit (expense)	-11,194,000	7,491,000	-14,194,000
Change in amount of deferred tax assets	-4,700,000	27,900,000	-17,500,000
Interconnect Hardware Development Program	'	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]	'	'	'
Change in amount of deferred tax assets	'	18,400,000	'
Research Tax Credit Carryforward	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Tax credit carryforwards	20,100,000	'	'
Domestic Tax Authority	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Net operating loss carryforwards	129,400,000	'	'
Stock based income tax deductions in excess of amounts recognized	43,000,000	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]	'	'	'
Change in amount of deferred tax assets	13,500,000	10,700,000	13,900,000
Foreign Tax Authority	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Net operating loss carryforwards	11,200,000	'	'
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]	'	'	'
Change in amount of deferred tax assets	'	'	$800,000

Income_Taxes_Tax_Provision_Det

Income Taxes Tax Provision (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current provision (benefit):	'	'	'
Federal	$484	$1,162	($106)
State	696	2,768	37
Foreign	801	541	271
Total current provision	1,981	4,471	202
Deferred provision (benefit):	'	'	'
Federal	-13,160	1,362	-12,935
State	-327	1,415	-936
Foreign	312	243	-525
Total deferred provision (benefit)	-13,175	3,020	-14,396
Total provision (benefit) for income taxes	($11,194)	$7,491	($14,194)

Income_Taxes_Reconciliation_of

Income Taxes Reconciliation of Statutory Federal Tax Rate (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]	'	'	'
Income tax provision at statutory rate	$7,360	$59,056	$47
State taxes, net of federal benefit	369	4,183	-972
Foreign income taxes	-749	-518	-406
Income Tax Reconciliation, Adjustments to Deferred Tax Assets	-8,419	0	0
Deemed dividends for U.S. income tax purposes	477	2,352	338
Nondeductible expenses	208	549	242
Liquidation of subsidiary	0	-30,704	0
Disallowed compensation	19	492	0
Research and development tax credit	-5,736	0	-1,524
Effect of change in valuation allowance on deferred tax assets	-4,723	-27,919	-11,919
Total provision (benefit) for income taxes	($11,194)	$7,491	($14,194)

Income_Taxes_Deferred_Tax_Asse

Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Tax Assets, Gross [Abstract]	'	'
Inventory	$3,388	$5,397
Accrued compensation	460	912
Deferred revenue	12,100	6,185
Net operating loss carryforwards	5,922	3,467
Other	8,120	1,092
Gross current deferred tax assets	29,990	17,053
Valuation allowance	-20,107	-13,970
Current deferred tax assets	9,883	3,083
Other	-688	0
Current deferred tax liabilities	-688	0
Net current deferred tax asset	9,195	3,083
Property and equipment	328	411
Research and experimentation credit carryforwards	23,941	18,301
Net operating loss carryforwards	47,154	59,039
Goodwill	628	912
Other	10,161	5,563
Gross long-term deferred tax assets	82,212	84,226
Valuation allowance	-57,687	-68,547
Long-term deferred tax assets	24,525	15,679
Deferred Income Tax Liabilities	'	'
Property and equipment	-1,905	-1,363
Intangible assets	-2,059	-3,002
Other	-1,355	-1,273
Long-term deferred tax liabilities	-5,319	-5,638
Net long-term deferred tax asset	$19,206	$10,041

Income_Taxes_Unrecognized_Tax_

Income Taxes Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]	'	'	'	'
Cash and cash equivalents	$192,633,000	$253,065,000	$50,411,000	$57,381,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]	'	'	'	'
Balance at December 31,	470,000	0	20,000	'
Lapse of statute of limitations	'	'	-20,000	'
Increase related to current year income tax positions	'	470,000	'	'
Decrease related to prior year income tax positions	-268,000	'	'	'
Balance at December 31,	202,000	470,000	0	'
Balance of unrecognized tax benefits that if recognized would affect the effective tax rate	200,000	'	'	'
Foreign Subsidiaries	'	'	'	'
Income Tax Contingency [Line Items]	'	'	'	'
Cash and cash equivalents	$30,600,000	'	'	'

Lines_of_Credit_Details

Lines of Credit (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]	'	'
Letters of Credit Outstanding, Amount	$32,700,000	'
Long-term restricted cash	13,768,000	0
Letter of Credit	'	'
Line of Credit Facility [Line Items]	'	'
Long-term restricted cash	13,800,000	'
Wells Fargo Bank	'	'
Line of Credit Facility [Line Items]	'	'
Amount of credit facility	10,000,000	'
Silicon Valley Bank	'	'
Line of Credit Facility [Line Items]	'	'
Amount of credit facility	$10,000,000	'

Narrative_Details

Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Preferred stock, shares Authorized	5,000,000	5,000,000	'	'
Common stock and additional paid-in capital, shares authorized	75,000,000	75,000,000	'	'
Common stock and additional paid-in capital, par value	$0.01	$0.01	'	'
Aggregate shares of restricted stock issued	755,979	1,316,447	513,587	'
Exercise of stock options	$3,161,000	$7,430,000	$1,090,000	'
Amount remaining to be expensed	25,200,000	'	'	'
Performance vesting for restricted stock	16,300,000	'	'	'
Performance vesting restricted stock subject to performance measures	300,000	'	'	'
Aggregate intrinsic value of outstanding stock option (In USD)	37,800,000	'	'	'
Aggregate intrinsic value of exercisable stock option (In USD)	26,000,000	'	'	'
Total intrinsic value of shares exercised (In USD)	7,900,000	7,600,000	500,000	'
Unrecognized compensation cost, weighted average period	'1 year 10 months 24 days	'	'	'
Shares issued under ESPP	1,022,610	998,118	959,784	'
Performance Vesting Restricted Stock Subject To Performance Measures Which Are Currently Not Considered Probable	1,081,500	737,000	0	'
Employee Stock	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Available for grant	1,750,000	'	'	'
Percentage permitted to acquire shares of common stock of payroll deductions	15.00%	'	'	'
Percentage of closing market price for purchase price	95.00%	'	'	'
Restricted Stock Units (RSUs)	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Issued and outstanding restricted units	0	12,500	15,000	'
Restricted Stock and Restricted Stock Units (RSU's)	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Exercise of stock options	15,800,000	15,800,000	3,100,000	'
Issued and outstanding restricted units	2,221,700	2,202,738	1,302,414	1,380,491
Aggregate fair value of restricted stock vested (In USD)	14,000,000	4,200,000	2,900,000	'
Unrecognized compensation cost (In USD)	$29,900,000	'	'	'
NonEmployee Director | Restricted Stock and Restricted Stock Units (RSU's)	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period of stock option	'2 years	'	'	'
Officers and Key Employees | Restricted Stock and Restricted Stock Units (RSU's)	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Vesting period of stock option	'4 years	'	'	'

Shareholders_Equity_Assumption

Shareholders' Equity Assumptions (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Key weighted average assumptions used in determining the fair value	'	'	'
Risk-free interest rate	0.98%	0.56%	0.67%
Expected dividend yield	0.00%	0.00%	0.00%
Volatility	50.45%	74.84%	74.37%
Expected life (in years)	'4 years	'4 years	'4 years
Weighted average Black-Scholes value of options granted	$8.22	$6.56	$3.34
Estimated forfeiture rates	10.00%	6.60%	5.20%

Stock_Activity_Details

Stock Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock option activity	'	'	'
Options outstanding, beginning of period	2,293,505	3,417,920	3,445,710
Weighted Average Exercise Price, Outstanding, Beginning of Period	$7.31	$6.28	$6.20
Options, Grants (In Shares)	346,360	359,500	476,500
Weighted Average Exercise Price, Grants (Per Share)	$20.65	$11.90	$6.08
Options, Exercises (Per Share)	-495,221	-1,346,326	-248,271
Weighted Average Exercise Price, Exercises (Per Share)	$6.38	$5.52	$4.39
Options, Cancellations (In Shares)	-66,575	-137,589	-256,019
Weighted Average Exercise Price, Cancellations (Per Share)	$21.97	$11.35	$6.65
Options outstanding, end of period	2,078,069	2,293,505	3,417,920
Weighted Average Exercise Price, Outstanding, End of Period	$9.29	$7.31	$6.28
Options, Exercisable	1,233,951	'	'
Weighted Average Exercise Price, Exercisable	$6.35	'	'
Weighted Average Remaining Contractual Term, Outstanding	'7 years	'	'
Weighted Average Remaining Contractual Term, Exercisable	'5 years 10 months 24 days	'	'
Available for grant	3,171,322	'	'

Restricted_Stock_Details

Restricted Stock (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unvested restricted stock grants and restricted stock units changes	'	'	'
Weighted Average Grant Date Fair Value, Granted	$8.22	$6.56	$3.34
Restricted Stock and Restricted Stock Units (RSU's)	'	'	'
Unvested restricted stock grants and restricted stock units changes	'	'	'
Shares, Outstanding, Beginning of Period	2,202,738	1,302,414	1,380,491
Weighted Average Grant Date Fair Value, Outstanding, Beginning of Period	$9.27	$5.47	$4.77
Shares, Granted	755,979	1,316,447	513,587
Weighted Average Grant Date Fair Value, Granted	$20.93	$11.99	$6.04
Shares, Forfeited (In Shares)	-75,437	-31,771	-146,677
Weighted Average Grant Date Fair Value, Forfeited	$14.48	$7.64	$5.29
Shares, Vested (In Shares)	-661,580	-384,352	-444,987
Weighted Average Grant Date Fair Value, Vested	$6.22	$5.86	$4.03
Shares, Outstanding, End of Period	2,221,700	2,202,738	1,302,414
Weighted Average Grant Date Fair Value, Outstanding, End of Period	$13.97	$9.27	$5.47

Shareholders_Equity_Exercise_P

Shareholders' Equity Exercise Price Range (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Lower Range	$0
Upper Range	$50.28
Number Outstanding	2,078,069
Weighted Average Remaining Life (Years)	'7 years
Weighted Average Exercise Price	$9.29
Number Exercisable	1,233,951
Weighted Average Exercise Price	$6.35
$ 0.00 - $ 4.00	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Lower Range	$0
Upper Range	$4
Number Outstanding	348,488
Weighted Average Remaining Life (Years)	'5 years 3 months
Weighted Average Exercise Price	$3.72
Number Exercisable	348,488
Weighted Average Exercise Price	$3.72
$ 4.01 - $ 6.00	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Lower Range	$4.01
Upper Range	$6
Number Outstanding	352,269
Weighted Average Remaining Life (Years)	'6 years 1 month
Weighted Average Exercise Price	$5.47
Number Exercisable	296,668
Weighted Average Exercise Price	$5.47
$ 6.01 - $ 8.00	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Lower Range	$6.01
Upper Range	$8
Number Outstanding	564,801
Weighted Average Remaining Life (Years)	'6 years 9 months
Weighted Average Exercise Price	$6.28
Number Exercisable	343,010
Weighted Average Exercise Price	$6.40
$ 8.01 - $ 50.28	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Lower Range	$8.01
Upper Range	$50.28
Number Outstanding	812,511
Weighted Average Remaining Life (Years)	'8 years 3 months
Weighted Average Exercise Price	$15.42
Number Exercisable	245,785
Weighted Average Exercise Price	$11.09

Expense_Details

Expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Gross share-based compensation cost recorded in the condensed consolidated statements of operations	'	'	'
Total share-based compensation expense	$7,239	$5,963	$3,628
Cost of product revenue	'	'	'
Gross share-based compensation cost recorded in the condensed consolidated statements of operations	'	'	'
Total share-based compensation expense	135	57	177
Cost of service revenue	'	'	'
Gross share-based compensation cost recorded in the condensed consolidated statements of operations	'	'	'
Total share-based compensation expense	229	258	369
Research and development	'	'	'
Gross share-based compensation cost recorded in the condensed consolidated statements of operations	'	'	'
Total share-based compensation expense	1,480	1,327	784
Sales and marketing	'	'	'
Gross share-based compensation cost recorded in the condensed consolidated statements of operations	'	'	'
Total share-based compensation expense	2,230	1,717	490
General and administrative	'	'	'
Gross share-based compensation cost recorded in the condensed consolidated statements of operations	'	'	'
Total share-based compensation expense	$3,165	$2,604	$1,808

Benefit_Plans_Details

Benefit Plans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
United States Pension Plans of US Entity, Defined Benefit	'	'	'
Defered Compensation Arrangement with Individual [Line Items]	'	'	'
Company match expense	$1.20	$1	$1.10
Foreign Pension Plans, Defined Benefit	'	'	'
Defered Compensation Arrangement with Individual [Line Items]	'	'	'
Projected benefit	2.6	2.4	'
Amount over the projected benefit	$0.20	$0.10	'

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Information of Operating Segments	'	'	'	'	'	'	'	'	'	'	'
Total revenue	$307,369	$54,366	$84,467	$79,547	$188,829	$35,739	$84,183	$112,307	$525,749	$421,058	$236,046
Total cost of revenue	194,420	33,940	57,666	55,397	134,634	18,407	49,688	67,151	341,423	269,880	141,680
Total gross profit	112,949	20,426	26,801	24,150	54,195	17,332	34,495	45,156	184,326	151,178	94,366
HPC Systems	'	'	'	'	'	'	'	'	'	'	'
Information of Operating Segments	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	369,623	298,255	139,590
Total cost of revenue	'	'	'	'	'	'	'	'	259,167	193,296	90,686
Total gross profit	'	'	'	'	'	'	'	'	110,456	104,959	48,904
Maintenance & Support	'	'	'	'	'	'	'	'	'	'	'
Information of Operating Segments	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	77,842	62,244	62,386
Total cost of revenue	'	'	'	'	'	'	'	'	39,233	36,510	31,558
Total gross profit	'	'	'	'	'	'	'	'	38,609	25,734	30,828
Storage and Data Management	'	'	'	'	'	'	'	'	'	'	'
Information of Operating Segments	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	63,887	50,246	7,197
Total cost of revenue	'	'	'	'	'	'	'	'	38,165	35,642	6,557
Total gross profit	'	'	'	'	'	'	'	'	25,722	14,604	640
Engineering Services and Other	'	'	'	'	'	'	'	'	'	'	'
Information of Operating Segments	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	14,397	10,313	26,873
Total cost of revenue	'	'	'	'	'	'	'	'	4,858	4,432	12,879
Total gross profit	'	'	'	'	'	'	'	'	9,539	5,881	13,994
Operating Segments [Member]	'	'	'	'	'	'	'	'	'	'	'
Information of Operating Segments	'	'	'	'	'	'	'	'	'	'	'
Total revenue	'	'	'	'	'	'	'	'	525,749	421,058	236,046
Total cost of revenue	'	'	'	'	'	'	'	'	341,423	269,880	141,680
Total gross profit	'	'	'	'	'	'	'	'	$184,326	$151,178	$94,366

Segment_Information_Product_an

Segment Information - Product and Services Revenue and Long-Lived Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue by geographic location	'	'	'
Product revenue	$436,330	$353,767	$155,561
Service revenue	89,419	67,291	80,485
Long-lived assets	65,056	62,009	32,366
United States	'	'	'
Revenue by geographic location	'	'	'
Product revenue	297,583	301,162	95,929
Service revenue	62,072	42,359	56,660
Long-lived assets	58,910	57,549	28,281
All Other Countries	'	'	'
Revenue by geographic location	'	'	'
Product revenue	138,747	52,605	59,632
Service revenue	27,347	24,932	23,825
Long-lived assets	$6,146	$4,460	$4,085

Segment_Information_Textuals_D

Segment Information Textuals (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue, Major Customer [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue	$307,369	$54,366	$84,467	$79,547	$188,829	$35,739	$84,183	$112,307	$525,749	$421,058	$236,046
All Other Countries	'	'	'	'	'	'	'	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Percentage of total revenue	'	'	'	'	'	'	'	'	10.00%	'	'
Germany	'	'	'	'	'	'	'	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Percentage of total revenue	'	'	'	'	'	'	'	'	'	'	12.00%
Revenue	'	'	'	'	'	'	'	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk, Number of Customers	2	'	'	'	3	'	'	'	2	3	2
Revenue | All Other Countries	'	'	'	'	'	'	'	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Concentration Risk, Number of Customers	0	'	'	'	'	'	'	'	0	'	'
US. government agencies and customers	'	'	'	'	'	'	'	'	'	'	'
Revenue, Major Customer [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Revenue	'	'	'	'	'	'	'	'	$266,100	$286,900	$127,800
Percentage of total revenue	'	'	'	'	'	'	'	'	22.00%	63.00%	30.00%

Research_and_Development_Detai

Research and Development (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Research and Development [Abstract]	'	'	'
Gross research and development expenses	$92,469	$86,305	$76,993
Less: Amounts included in cost of revenue	-3,741	-1,080	-410
Less: Reimbursed research and development (excludes amounts in revenue)	1,000	20,922	27,131
Net research and development expenses	$87,728	$64,303	$49,452

Interest_Income_Expense_Detail

Interest Income (Expense) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income and Expenses [Abstract]	'	'	'
Interest income	$894	$397	$229
Interest expense	-137	-193	-262
Net interest income (expense)	$757	$204	($33)

Quarterly_Data_Unaudited_Detai

Quarterly Data (Unaudited) (Details) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	2-May-12	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Information [Abstract]	'	'	'	'	'	'	'	'	'	'	'	'
Revenue	'	$307,369	$54,366	$84,467	$79,547	$188,829	$35,739	$84,183	$112,307	$525,749	$421,058	$236,046
Cost of revenue	'	194,420	33,940	57,666	55,397	134,634	18,407	49,688	67,151	341,423	269,880	141,680
Gross profit	'	112,949	20,426	26,801	24,150	54,195	17,332	34,495	45,156	184,326	151,178	94,366
Research and development, net	'	25,979	21,555	19,968	20,226	18,177	15,483	6,893	23,750	'	'	'
Sales and marketing	'	17,172	11,480	11,550	11,143	12,579	6,495	10,233	7,873	51,345	37,180	26,134
General and administrative	'	8,063	4,970	5,085	5,485	7,282	3,324	4,971	5,130	23,603	20,707	15,840
Net income	'	51,007	-11,025	-150	-7,609	14,006	-5,151	147,422	4,964	32,223	161,241	14,329
Net income (loss) per common share, basic	'	$1.33	($0.29)	$0	($0.20)	$0.38	($0.14)	$4.05	$0.14	$0.85	$4.42	$0.41
Net income (loss) per common share, diluted	'	$1.27	($0.29)	$0	($0.20)	$0.36	($0.14)	$3.90	$0.13	$0.81	$4.27	$0.40
Net gain on sale of interconnect hardware development program	$139,100	'	'	'	'	'	'	'	'	$0	$139,068	$0

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Details) (Allowance for Trade Receivables, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Trade Receivables	'	'	'
Movement in Valuation Allowances and Reserves [Roll Forward]	'	'	'
Balance at Beginning of Period	$5	$110	$123
Charge/(Benefit) to Expense	179	-62	-13
Deductions	-27	-43	0
Balance at End of Period	$157	$5	$110