Align Technology (ALGN) 10-Q 31 Jul 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 25, 2014
Document Information [Line Items]	'	'
Trading Symbol	'ALGN	'
Entity Registrant Name	'ALIGN TECHNOLOGY INC	'
Entity Central Index Key	'0001097149	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Amendment Flag	'false	'
Entity Common Stock, Shares Outstanding	'	80,793,072

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended				6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Net revenues	$192,531	[1]	$163,828	[1]	$373,177	[1]	$317,408	[1]
Cost of net revenues	47,055		40,137		90,450		80,868
Gross profit	145,476		123,691		282,727		236,540
Operating expenses:	'		'		'		'
Sales and marketing	56,386		47,847		109,274		90,128
General and administrative	27,069		27,027		56,248		57,375
Research and development	13,289		10,916		26,669		22,198
Impairment of goodwill	0		0		0		40,693
Asset Impairment Charges	0		0		0		26,320
Total operating expenses	96,744		85,790		192,191		236,714
Profit from operations	48,732		37,901		90,536		-174
Interest and other income (expense), net	-93		-335		508		-1,323
Net profit before provision for income taxes	48,639		37,566		91,044		-1,497
Provision for income taxes	13,039		8,246		23,000		11,166
Net profit (loss)	$35,600		$29,320		$68,044		($12,663)
Net profit (loss) per share:	'		'		'		'
Basic (in usd per share)	$0.44		$0.36		$0.84		($0.16)
Diluted (in usd per share)	$0.43		$0.36		$0.82		($0.16)
Shares used in computing net profit (loss) per share:	'		'		'		'
Basic (in shares)	81,027		80,576		81,073		80,909
Diluted (in shares)	82,341		82,149		82,651		80,909
[1]	Net revenues are attributed to countries based on location of where revenue is recognized.

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net profit (loss)	$35,600	$29,320	$68,044	($12,663)
Foreign currency translation adjustments	-4	-8	102	-64
Change in unrealized gains (losses) on available-for-sale securities, net of tax	70	-186	112	-183
Net change in accumulated other comprehensive income (losses)	66	-194	214	-247
Other comprehensive income (loss)	$35,666	$29,126	$68,258	($12,910)

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$167,471	$242,953
Marketable securities, short-term	198,059	127,040
Accounts receivable, net of allowances for doubtful accounts and returns of $1,969 and $1,733, respectively	131,028	113,250
Inventories	13,115	13,968
Prepaid expenses and other current assets	44,839	47,465
Total current assets	554,512	544,676
Marketable securities, long-term	137,148	101,978
Property, plant and equipment, net	81,312	75,743
Goodwill	83,795	85,362
Deferred tax assets	20,456	15,766
Other assets	8,210	8,622
Total assets	885,433	832,147
Current liabilities:	'	'
Accounts payable	20,939	17,718
Accrued liabilities	81,049	80,345
Deferred revenues	85,125	77,275
Total current liabilities	187,113	175,338
Other long-term liabilities	22,524	22,839
Total liabilities	209,637	198,177
Commitments and contingencies (Note 7)	'	'
Stockholders' equity:	'	'
Preferred stock, $0.0001 par value (5,000 shares authorized; none issued)	0	0
Common stock, $0.0001 par value (200,000 shares authorized; 80,783 and 80,583 issued and outstanding at 2014 and 2013, respectively)	8	8
Additional paid-in capital	742,886	729,578
Accumulated other comprehensive income (loss), net	508	294
Accumulated deficit	-67,606	-95,910
Total stockholders' equity	675,796	633,970
Total liabilities and stockholders' equity	$885,433	$832,147

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Accounts receivable, allowance for doubtful accounts and returns	$1,969	$1,733
Preferred stock, par value (in usd per share)	$0.00	$0.00
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Common stock, par value (in usd per share)	$0.00	$0.00
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	80,783	80,583
Common stock, shares outstanding	80,783	80,583

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net profit (loss)	$68,044	($12,663)
Adjustments to reconcile net profit to net cash provided by operating activities:	'	'
Deferred taxes	17,496	6,272
Depreciation, Depletion and Amortization	9,130	8,789
Stock-based compensation	19,438	13,675
Excess tax benefit from share-based payment arrangements	-16,161	-15,331
Impairment of goodwill	0	40,693
Asset Impairment Charges	0	26,320
Other Noncash Income (Expense)	5,095	389
Changes in assets and liabilities, net of acquired assets and liabilities:	'	'
Accounts receivable	-21,407	-9,050
Inventories	855	-581
Prepaid expenses and other assets	-2,806	-234
Accounts payable	-9	50
Accrued and other long-term liabilities	1,343	3,298
Deferred revenues	6,705	2,099
Net cash provided by operating activities	87,723	63,726
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Payments to Acquire Businesses, Net of Cash Acquired	0	-7,652
Purchase of property, plant and equipment	-9,960	-9,389
Purchase of marketable securities	-232,178	-150,806
Maturities of marketable securities	92,005	18,117
Proceeds from Sale of Available-for-sale Securities	32,683	5,043
Other assets	-133	915
Net cash used in investing activities	-117,583	-143,772
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Proceeds from issuance of common stock	12,622	21,128
Common stock repurchase	-49,000	-95,108
Equity forward contract related to accelerated share repurchase	-21,000	0
Excess tax benefit from share-based payment arrangements	16,161	15,331
Employees' taxes paid upon the vesting of restricted stock units	-4,650	-3,234
Other financing activities	0	-13
Net cash provided by financing activities	-45,867	-61,896
Effect of foreign exchange rate changes on cash and cash equivalents	245	53
Net increase (decrease) in cash and cash equivalents	-75,482	-141,889
Cash and cash equivalents, beginning of the period	242,953	306,386
Cash and cash equivalents, end of the period	$167,471	$164,497

Summary_of_Significant_Account

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Basis of presentation
	The accompanying unaudited Condensed Consolidated Financial Statements have been prepared by Align Technology, Inc. (“we”, “our”, or “Align”) in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") and contain all adjustments, including normal recurring adjustments, necessary to present fairly our results of operations for the three and six months ended June 30, 2014 and 2013, our comprehensive income (loss) for the three and six months ended June 30, 2014 and 2013, our financial position as of June 30, 2014 and our cash flows for the six months ended June 30, 2014 and 2013. The Condensed Consolidated Balance Sheet as of December 31, 2013 was derived from the December 31, 2013 audited financial statements. Net revenues by geographic area for prior period amounts in Note 13 have been reclassified to conform with the current period presentation. These reclassifications had no impact on our financial position for the three or six months ended June 30, 2014 and 2013.
	The results of operations for the three months ended June 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014 or any other future period, and we make no representations related thereto. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in our Annual Report on Form 10-K for the year ended December 31, 2013.
	Use of estimates
	The preparation of financial statements in conformity with generally accepted accounting principles ("GAAP") in the United States of America (“U.S.”) requires our management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. On an ongoing basis, we evaluate our estimates, including those related to the fair values of financial instruments, long-lived assets and goodwill, useful lives of intangible assets and property and equipment, stock-based compensation, income taxes, and contingent liabilities, among others. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, “Revenue from Contracts with Customers,” requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. Early adoption is not permitted. The updated standard becomes effective for us in the first quarter of fiscal 2017. We have not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures.

Marketable_Securities_and_Fair

Marketable Securities and Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Notes To Financial Statements [Abstract]	'
Marketable Securities and Fair Value Measurements	'
	Note 2. Marketable Securities and Fair Value Measurements
	As of June 30, 2014 and December 31, 2013, the estimated fair value of our short-term and long-term marketable securities, classified as available for sale, are as follows (in thousands):
	Short-term
	June 30, 2014	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Commercial paper	$	51,103	$	—	$	—		$	51,103
	Corporate bonds	88,333		55		(16		)	88,372
	U.S. government agency bonds	22,729		7		(1		)	22,735
	Asset-backed securities	14,341		10		—			14,351
	Municipal securities	11,663		24		—			11,687
	U.S. dollar dominated foreign corporate bonds	921		4		—			925
	U.S. government treasury bonds	8,876		10		—			8,886
	Total Marketable Securities, Short-Term	$	197,966	$	110	$	(17	)	$	198,059
	Long-term
	June 30, 2014	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Corporate bonds	$	62,996	$	34	$	(36	)	$	62,994
	U.S. government agency bonds	31,025		26		—			31,051
	Asset-backed securities	20,330		11		(8		)	20,333
	U.S. government treasury bonds	16,269		16		—			16,285
	Municipal securities	6,470		15		—			6,485
	Total Marketable Securities, Long-Term	$	137,090	$	102	$	(44	)	$	137,148
	Short-term
	December 31, 2013	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Commercial paper	$	54,318	$	10	$	—		$	54,328
	Corporate bonds	29,079		10		(4		)	29,085
	U.S. government agency bonds	16,693		10		—			16,703
	U.S. dollar dominated foreign corporate bonds	13,959		12		—			13,971
	Municipal securities	7,006		11		(3		)	7,014
	Asset-backed securities	5,937		2		—			5,939
	Total Marketable Securities, Short-Term	$	126,992	$	55	$	(7	)	$	127,040
	Long-term
	31-Dec-13	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	U.S. government agency bonds	$	38,138	$	1	$	(21	)	$	38,118
	Corporate bonds	23,308		14		(9		)	23,313
	U.S. dollar dominated foreign corporate bonds	19,485		27		(17		)	19,495
	Municipal securities	8,326		13		(8		)	8,331
	U.S. government treasury bonds	6,916		3		—			6,919
	Asset-backed securities	5,800		4		(2		)	5,802
	Total Marketable Securities, Long-Term	$	101,973	$	62	$	(57	)	$	101,978
	For the three and six months ended June 30, 2014 and 2013, realized gains were immaterial. Unrealized gains and losses for our available for sale securities as of June 30, 2014 and December 31, 2013 were also immaterial. Cash and cash equivalents are not included in the table above as the gross unrealized gains and losses are not material. We have no material short-term or long-term investments that have been in a continuous unrealized loss position for greater than twelve months as of June 30, 2014 and December 31, 2013. Amounts reclassified to earnings from accumulated other comprehensive income related to unrealized gain or losses were immaterial for the three and six months ended June 30, 2014 and 2013.
	Our fixed-income securities investment portfolio consists of corporate bonds, U.S. dollar dominated foreign corporate bonds, commercial paper, municipal securities, U.S. government agency bonds, U.S. government treasury bonds, and asset-backed securities that have a maximum maturity of 27 months. The securities that we invest in are generally deemed to be low risk based on their credit ratings from the major rating agencies. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. As interest rates increase, those securities purchased at a lower yield show a mark-to-market unrealized loss. The unrealized losses are due primarily to changes in credit spreads and interest rates. We expect to realize the full value of all these investments upon maturity or sale. The weighted average remaining duration of these securities was approximately 10 months as of June 30, 2014 and December 31, 2013.
	As the carrying value approximates the fair value for our short-term and long-term marketable securities shown in the tables above, the following table summarizes the fair value of our short-term and long-term marketable securities classified by maturity as of June 30, 2014 and December 31, 2013 (in thousands):
		June 30,		December 31,
		2014		2013
	Due in one year or less	$	198,059	$	127,040
	Due in one year to 27 months	137,148		101,978
	Total available for sale short-term and long-term marketable securities	$	335,207	$	229,018
	Fair Value Measurements
	We measure the fair value of our cash equivalents and marketable securities as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We use the GAAP fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. This hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of inputs that may be used to measure fair value:
	Level 1 — Quoted (unadjusted) prices in active markets for identical assets or liabilities.
	Our Level 1 assets consist of money market funds and U.S. government treasury bonds. We did not hold any Level 1 liabilities as of June 30, 2014 or December 31, 2013.
	Level 2 — Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities 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 asset or liability.
	Our Level 2 assets consist of commercial paper, corporate bonds, U.S. government agency bonds, asset-backed securities, municipal securities, U.S. dollar dominated foreign corporate bonds, U.S. government treasury bonds and our Israeli funds that are mainly invested in insurance policies. We obtain fair values for Level 2 investments from our asset manager for each of our portfolios. Our custody bank and asset managers independently use professional pricing services to gather pricing data which may include quoted market prices for identical or comparable financial instruments, or inputs other than quoted prices that are observable either directly or indirectly, and we are ultimately responsible for these underlying estimates.
	We did not hold any Level 2 liabilities as of June 30, 2014 or December 31, 2013.
	Level 3 — Unobservable inputs to the valuation methodology that are supported by little or no market activity and that are significant to the measurement of the fair value of the assets or liabilities. Level 3 assets and liabilities include those whose fair value measurements are determined using pricing models, discounted cash flow methodologies or similar valuation techniques, as well as significant management judgment or estimation.
	We did not hold any Level 3 assets or liabilities as of June 30, 2014 or December 31, 2013.
Non-Recurring Fair Value Measurements
During the six months ended June 30, 2013, we recorded an impairment charge to our long-lived assets and goodwill of $26.3 million and $40.7 million, respectively, related to our Scanner and Services ("Scanner") reporting unit, formerly referred to as Scanner and CAD/CAM Services ("SCCS"), as an event occurred and circumstances changed that led us to perform an impairment analysis prior to our annual test which required us to determine the fair value of the Scanner reporting unit (Refer to Note 5). These fair value measurements were calculated using unobservable inputs, using the income approach which is classified as Level 3 within the fair value hierarchy. Inputs for the income approach includes the amount and timing of future cash flows based on our most recent operational budgets, strategic plans, terminal growth rates assumptions and other estimates.
Recurring Fair Value Measurements
The following table summarizes our financial assets measured at fair value on a recurring basis as of June 30, 2014 and December 31, 2013 (in thousands):
Description	Balance as of		Quoted Prices in		Significant Other
	30-Jun-14		Active  Markets for		Observable  Inputs
			Identical Assets		(Level 2)
			(Level 1)
Cash equivalents:
Money market funds	$	59,929	$	59,929	$	—
Commercial paper	32,244		—		32,244
Short-term investments:
Commercial paper	51,103		—		51,103
Corporate bonds	88,372		—		88,372
U.S. government agency bonds	22,735		—		22,735
Asset-backed securities	14,351		—		14,351
Municipal securities	11,687		—		11,687
U.S. dollar dominated foreign corporate bonds	925		—		925
U.S. government treasury bonds	8,886		8,886		—
Long-term investments:
Corporate bonds	62,994		—		62,994
U.S. government agency bonds	31,051		—		31,051
Asset-backed securities	20,333		—		20,333
U.S. government treasury bonds	16,285		16,285		—
Municipal securities	6,485		—		6,485
Other assets:
Israeli funds	2,434		—		2,434
	$	429,814	$	85,100	$	344,714
Description	Balance as of		Quoted Prices in		Significant Other
	December 31, 2013		Active  Markets for		Observable  Inputs
			Identical Assets		(Level 2)
			(Level 1)
Cash equivalents:
Money market funds	$	143,540	$	143,540	$	—
Commercial paper	15,398		—		15,398
Short-term investments:
Commercial paper	54,328		—		54,328
Corporate bonds	29,085		—		29,085
U.S. dollar denominated foreign corporate bonds	13,971		—		13,971
U.S. government agency bonds	16,703		—		16,704
Municipal securities	7,014		—		7,014
Asset-backed securities	5,939		—		5,938
Long-term investments:
U.S. government agency bonds	38,118		—		38,118
Corporate bonds	23,313		—		23,313
U.S. dollar denominated foreign corporate bonds	19,495		—		19,495
Municipal securities	8,331		—		8,331
U.S. government treasury bonds	6,919		6,919		—
Asset-backed securities	5,802		—		5,802
Other assets:
Israeli funds	2,193		—		2,193
	$	390,149	$	150,459	$	239,690

Balance_Sheet_Components

Balance Sheet Components	6 Months Ended
	Jun. 30, 2014
Balance Sheet Components	'
	Balance Sheet Components
	Inventories
	Inventories consist of the following (in thousands):
		June 30,			December 31,
		2014			2013
	Raw materials	$	3,493		$	5,172
	Work in process	3,430			4,241
	Finished goods	6,192			4,555
	Total Inventories	$	13,115		$	13,968
	Work in process includes costs to produce our clear aligner and intra-oral products. Finished goods primarily represent our intra-oral scanners and ancillary products that support our clear aligner products.
	Accrued liabilities
	Accrued liabilities consist of the following (in thousands):
		June 30,			December 31,
		2014			2013
	Accrued payroll and benefits	$	43,332		$	43,029
	Accrued sales rebates	10,137			10,100
	Accrued sales tax and value added tax	6,447			6,215
	Accrued sales and marketing expenses	4,488			3,893
	Accrued accounts payable	2,504			4,053
	Accrued warranty	3,252			3,104
	Accrued professional fees	1,872			1,892
	Accrued income taxes	2,248			1,205
	Other accrued liabilities	6,769			6,854
	Total Accrued Liabilities	$	81,049		$	80,345
	Warranty
	We regularly review the accrued warranty balances and update these balances based on historical warranty trends. Actual warranty costs incurred have not materially differed from those accrued; however, future actual warranty costs could differ from the estimated amounts.
	Clear Aligner
	We warrant our Invisalign products against material defects until the Invisalign case is complete. We accrue for warranty costs in cost of net revenues upon shipment of products. The amount of accrued estimated warranty costs is primarily based on historical experience as to product failures as well as current information on replacement costs.
	Scanners
	We warrant our scanners for a period of one year from the date of training and installation. We accrue for these warranty costs which includes materials and labor based on estimated historical repair costs. Extended service packages may be purchased for additional fees.
	Warranty accrual as of June 30, 2014 and 2013 consists of the following activity (in thousands):
		Six Months Ended June 30,
		2014			2013
	Balance at beginning of period	$	3,104		$	4,050
	Charged to cost of net revenues	1,195			2,784
	Actual warranty expenditures	(1,047		)	(2,381		)
	Balance at end of period	$	3,252		$	4,453

Business_Combinations_Notes

Business Combinations (Notes)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Business Combination Disclosure	'
	Business Combinations
	On April 30, 2013, we completed the acquisition of ICA Holdings Pty Limited ("ICA") upon the expiration of the distribution agreement between certain subsidiaries of ICA and Align Technology B.V., for a total cash consideration of approximately $8.6 million, of which $7.4 million was attributed to assets acquired, $2.4 million in liabilities assumed and $3.6 million to goodwill. Goodwill as a result of this acquisition represents the excess of the purchase price over the fair value of the underlying net assets acquired and represents the knowledge and experience of the workforce in place. None of this goodwill will be deductible for tax purposes. Under the applicable accounting guidance, goodwill will not be amortized but will be tested for impairment on an annual basis or more frequently if certain indicators are present.
	Pro forma results of operations for this acquisition have not been presented as it is not material to our results of operations, either individually or in aggregate, for the three or six months ended June 30, 2013.

Goodwill_and_Longlived_Assets

Goodwill and Long-lived Assets	6 Months Ended
	Jun. 30, 2014
Goodwill and Long-lived Assets	'
	Goodwill and Long-lived Assets
	Goodwill
	The change in the carrying value of goodwill for the six months ended June 30, 2014 by our reportable segments, which are also our reporting units, is as follows (in thousands):
		Clear Aligner
	Balance as of December 31, 2013	$	61,623
	Adjustments 1	184
	Balance as of June 30, 2014	$	61,807
	1 The adjustments to goodwill during the six months ended June 30, 2014 were due to foreign currency translation.
	The goodwill balance is entirely attributable to our Clear Aligner reporting unit. During the fourth quarter of fiscal 2013, we performed the annual goodwill impairment testing and found no impairment events as the fair value of our Clear Aligner reporting unit was significantly in excess of the carrying value.
	Impairment of Goodwill in 2013
	We evaluate our goodwill for impairment at least annually on November 30th or more frequently if indicators are present, an event occurs or circumstances change that suggest an impairment may exist and that it would more likely than not reduce the fair value of the reporting unit below its carrying amount. During March 2013, changes in the competitive environment for intra-oral scanners, including announcements from our competitors of new low-priced scanners targeted at orthodontists and general practitioner dentists in North America, that caused us to lower our expectations for growth and profitability for our Scanner reporting unit. As a result, we determined that goodwill related only to our Scanner reporting unit should be tested for impairment as of March 2013 due to these facts and circumstances which would more likely than not reduce the fair value of our Scanner reporting unit below its carrying amount. There was no triggering event related to our Clear Aligner goodwill.
	We performed a step one analysis for our Scanner reporting unit which consists of a comparison of the fair value of the Scanner reporting unit against its carrying amount, including the goodwill allocated to it. In deriving the fair value of the Scanner reporting unit, we utilized the income approach which is classified as Level 3 within the fair value hierarchy. This approach provides an estimated fair value based on discounted expected future cash flows, which are based on management's estimates of revenue growth rates and operating margins, taking into consideration industry and market conditions. The discount rate used is based on a weighted average cost of capital adjusted for the relevant risk associated with the characteristics of the business and the projected cash flows.
	As a result of our step one analysis, we concluded that the fair value of the Scanner reporting unit was less than its carrying value; therefore, we proceeded to step two of the goodwill impairment analysis. Step two of the goodwill impairment analysis measures the impairment charge by allocating the reporting unit's fair value to all of the assets and liabilities of the reporting unit in a hypothetical analysis that calculates the implied fair value of goodwill in the same manner as if the reporting unit was being acquired in a business combination. This allocation process was performed only for the purposes of measuring the goodwill impairment and not to adjust the carrying values of the recognized tangible assets and liabilities. Any excess of the carrying value of the reporting unit's goodwill over the implied fair value of the reporting unit's goodwill is recorded as an impairment loss. We use a discounted cash flow ("DCF") approach, utilizing the harvest model, to estimate the fair value of a reporting unit which we believe is the most reliable indicator of fair value of this business, and is most consistent with the approach a market place participant would use. Based on our analysis, there was no implied goodwill for the Scanner reporting unit; therefore, we recorded a goodwill impairment charge of $40.7 million in the three months ended March 31, 2013, which represents the remaining goodwill balance in the Scanner reporting unit. None of the goodwill impairment charge was deductible for tax purposes.
	Long-lived Assets
	Impairment of Long-lived Assets in 2013
	We amortize our intangible assets over their estimated useful lives. We evaluate long-lived assets, which includes property, plant and equipment and intangible assets, for impairment whenever events or changes in circumstances indicate the carrying value of an asset may not be recoverable. The carrying value is not recoverable if it exceeds the undiscounted cash flows resulting from the use of the asset and its eventual disposition. Our estimates of future cash flows attributable to our long-lived assets require significant judgment based on our historical and anticipated results and are subject to many factors. Factors we consider important which could trigger an impairment review include significant negative industry or economic trends, significant loss of customers and changes in the competitive environment of our intra-oral scanning business.
	During March 2013, changes in the competitive environment for intra-oral scanners, including announcements from our competitors of new low-priced scanners targeted at orthodontists and general practitioner dentists in North America, that caused us to lower our expectations for growth and profitability for our Scanner reporting unit. As a result, we determined that the carrying value of the Scanner long-lived assets was not recoverable as compared to the value of the undiscounted cash flows of our revised projections for the asset group. In order to determine the impairment amount of our long-lived assets, we fair valued each key component of our long-lived assets within the asset group, which involved the use of significant estimates and assumptions including replacement costs, revenue growth rates, operating margins, and plant and equipment cost trends. We use a DCF approach, utilizing the harvest model, to estimate the fair value of a reporting unit which we believe is the most reliable indicator of fair value of this business, and is most consistent with the approach a market place participant would use. The estimation of fair value utilizing a DCF approach includes numerous uncertainties which require our significant judgment when making assumptions of expected growth rates and the selection of discount rates, as well as assumptions regarding general economic and business conditions, and the structure that would yield the highest economic value, among other factors. Key assumptions used in measuring the fair values of the Scanner reporting unit included the discount rate (based on the weighted-average cost of capital) and revenue growth. The fair value of Scanner’s trademark was determined using a risk-adjusted DCF approach under the relief-from-royalty method. The royalty rate used was based on a consideration of market rates. The fair value of Scanner’s finite-lived customer relationships was determined using a DCF approach under the multi-period excess earnings method. We determined our long-lived asset group within the Scanner reporting unit to be primarily finite-lived intangible assets, plant and equipment. Upon completion of this analysis, we recorded a total impairment charge of $26.3 million of which $19.3 million represented the impairment related to our Scanner intangible assets and $7.0 million related to plant and equipment. There was no triggering event related to the Clear Aligner asset group.
	Intangible assets arising either as a direct result from the Cadent Holdings, Inc. acquisition ("Cadent") or individually acquired are being amortized as follows (in thousands):
		Weighted Average Amortization Period (in years)		Gross Carrying Amount as of		Accumulated			Accumulated			Net Carrying
				June 30, 2014		Amortization			Impairment Loss			Value as of
												30-Jun-14
	Trademarks	15		$	7,100	$	(1,285	)	$	(4,179	)	$	1,636
	Existing technology	13		12,600		(2,732		)	(4,328		)	5,540
	Customer relationships	11		33,500		(8,164		)	(10,751		)	14,585
	Other	8		285		(58		)	—			227
	Total Intangible Assets			$	53,485	$	(12,239	)	$	(19,258	)	$	21,988
		Weighted Average Amortization Period (in years)		Gross Carrying		Accumulated			Accumulated Impairment Loss			Net Carrying
				Amount as of		Amortization						Value as of
				31-Dec-13								December 31, 2013
	Trademarks	15		$	7,100	$	(1,100	)	$	(4,179	)	$	1,821
	Existing technology	13		12,600		(2,236		)	(4,328		)	6,036
	Customer relationships	11		33,500		(7,112		)	(10,751		)	15,637
	Other	8		285		(40		)	—			245
	Total Intangible Assets			$	53,485	$	(10,488	)	$	(19,258	)	$	23,739
	The total estimated annual future amortization expense for these acquired intangible assets as of June 30, 2014 is as follows (in thousands):
	Fiscal Year Ending December 31,
	Remainder of 2014	$	1,300
	2015	2,600
	2016	2,600
	2017	2,600
	2018	2,600
	Thereafter	10,288
	Total	$	21,988

Credit_Facilities

Credit Facilities	6 Months Ended
	Jun. 30, 2014
Notes To Financial Statements [Abstract]	'
Credit Facilities	'
	Credit Facilities
	On March 22, 2013, we entered into a credit facility with Wells Fargo Bank. The credit facility provides for a $50.0 million revolving line of credit, with a $10.0 million letter of credit sublimit, and has a maturity date on March 22, 2016. The credit facility also requires us to maintain a minimum unrestricted cash balance of $50.0 million and comply with specific financial conditions and performance requirements. The loan bears interest, at our option, at a fluctuating rate per annum equal to the daily one-month adjusted LIBOR rate plus a spread of 1.75% or an adjusted LIBOR rate (based on one, three, six or twelve-month interest periods) plus a spread of 1.75%. As of June 30, 2014, we had no outstanding borrowings under this credit facility and were in compliance with the conditions and performance requirements.

Legal_Proceedings_Notes

Legal Proceedings (Notes)	6 Months Ended
	Jun. 30, 2014
Legal Proceedings [Abstract]	'
Legal Proceedings	'
	Legal Proceedings
	Securities Class Action Lawsuit
	On November 28, 2012, plaintiff City of Dearborn Heights Act 345 Police & Fire Retirement System filed a lawsuit against Align, Thomas M. Prescott (“Mr. Prescott”), Align's President and Chief Executive Officer, and Kenneth B. Arola (“Mr. Arola”), Align's former Vice President, Finance and Chief Financial Officer, in the United States District Court for the Northern District of California on behalf of a purported class of purchasers of our common stock (the "Securities Action"). On July 11, 2013, an amended complaint was filed, which named the same defendants, on behalf of a purported class of purchasers of our common stock between January 31, 2012 and October 17, 2012. The amended complaint alleged that Align, Mr. Prescott and Mr. Arola violated Section 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder, and that Mr. Prescott and Mr. Arola violated Section 20(a) of the Securities Exchange Act of 1934. Specifically, the amended complaint alleged that during the purported class period defendants failed to take an appropriate goodwill impairment charge related to the April 29, 2011 acquisition of Cadent Holdings, Inc. in the fourth quarter of 2011, the first quarter of 2012 or the second quarter of 2012, which rendered our financial statements and projections of future earnings materially false and misleading and in violation of U.S. GAAP. The amended complaint sought monetary damages in an unspecified amount, costs and attorney's fees. On December 9, 2013, the court granted defendant's motion to dismiss with leave for plaintiff to file a second amended complaint. Plaintiff filed a second amended complaint on January 8, 2014 on behalf of the same purported class. The second amended complaint states the same claims as the first amended complaint. We filed a motion to dismiss the second amended complaint on February 7, 2014. On June 12, 2014, the Court held a hearing on our motion and took the matter under submission. Align intends to vigorously defend itself against these allegations. Align is currently unable to predict the outcome of this amended complaint and therefore cannot determine the likelihood of loss nor estimate a range of possible loss, if any.
	Shareholder Derivative Lawsuit
	On February 1, 2013, plaintiff Gary Udis filed a shareholder derivative lawsuit against several of Align's current and former officers and directors in the Superior Court of California, County of Santa Clara. The complaint alleges that our reported income and earnings were materially overstated because of a failure to timely write down goodwill related to the April 29, 2011 acquisition of Cadent Holdings, Inc., and that defendants made allegedly false statements concerning our forecasts. The complaint asserts various state law causes of action, including claims of breach of fiduciary duty, unjust enrichment, and insider trading, among others. The complaint seeks unspecified damages on behalf of Align, which is named solely as nominal defendant against whom no recovery is sought. The complaint also seeks an order directing Align to reform and improve its corporate governance and internal procedures, and seeks restitution in an unspecified amount, costs, and attorney's fees. On July 8, 2013, an Order was entered staying this derivative lawsuit until an initial ruling on our first motion to dismiss the Securities Action. On January 15, 2014, an Order was entered staying this derivative lawsuit until an initial ruling on our second motion to dismiss the Securities Action discussed above. Align intends to vigorously defend itself against these allegations. Align is currently unable to predict the outcome of this complaint and therefore cannot determine the likelihood of loss nor estimate a range of possible losses.
	In addition, in the course of Align's operations, Align is involved in a variety of claims, suits, investigations, and proceedings, including actions with respect to intellectual property claims, patent infringement claims, government investigations, labor and employment claims, breach of contract claims, tax, and other matters. Regardless of the outcome, these proceedings can have an adverse impact on us because of defense costs, diversion of management resources, and other factors. Although the results of complex legal proceedings are difficult to predict and Align's view of these matters may change in the future as litigation and events related thereto unfold; Align currently does not believe that these matters, individually or in the aggregate, will materially affect Align's financial position, results of operations or cash flows.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Notes To Financial Statements [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Operating Leases
	As of June 30, 2014, minimum future lease payments for non-cancelable operating leases are as follows (in thousands):
	Fiscal Year Ending December 31,	Operating leases
	Remainder of 2014	$	4,598
	2015	8,494
	2016	7,770
	2017	4,471
	2018	1,525
	Thereafter	494
	Total minimum future lease payments	$	27,352
	Off-balance Sheet Arrangements
	As of June 30, 2014, we had no off-balance sheet arrangements that have, or are reasonably likely to have, a current or future material effect on our consolidated financial condition, results of operations, liquidity, capital expenditures or capital resources.
	Indemnification Provisions
	In the normal course of business to facilitate transactions in our services and products, we indemnify certain parties: customers, vendors, lessors and other parties with respect to certain matters, including, but not limited to, services to be provided by us and intellectual property infringement claims made by third parties. In addition, we have entered into indemnification agreements with our directors and our executive officers that will require us, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. Several of these agreements limit the time within which an indemnification claim can be made and the amount of the claim.
	It is not possible to make a reasonable estimate of the maximum potential amount under these indemnification agreements due to the unique facts and circumstances involved in each particular agreement. Additionally, we have a limited history of prior indemnification claims and the payments we have made under such agreements have not had a material adverse effect on our results of operations, cash flows or financial position. However, to the extent that valid indemnification claims arise in the future, future payments by us could be significant and could have a material adverse effect on our results of operations or cash flows in a particular period. As of June 30, 2014, we did not have any material indemnification claims that were probable or reasonably possible.

Stockbased_Compensation

Stock-based Compensation	6 Months Ended
	Jun. 30, 2014
Stock-based Compensation	'
	Stock-based Compensation
	Summary of stock-based compensation expense
	As of June 30, 2014, we had a total reserve of 23,283,379 shares for issuance, plus up to an aggregate of 5,000,000 shares that would have been returned to our 2001 Stock Incentive Plan as a result of termination of options on or after March 28, 2005.
	Stock-based compensation is based on the estimated fair value of awards, net of estimated forfeitures, and recognized over the requisite service period. Estimated forfeitures are based on historical experience at the time of grant and may be revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The stock-based compensation related to all of our stock-based awards and employee stock purchases for the three and six months ended June 30, 2014 and 2013 is as follows (in thousands):
		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2014				2013				2014			2013
	Cost of net revenues	$	937			$	637			$	1,781		$	1,217
	Sales and marketing	3,111				2,012				5,778			3,023
	General and administrative	4,539				3,556				8,589			7,483
	Research and development	1,719				1,060				3,290			1,952
	Total stock-based compensation	$	10,306			$	7,265			$	19,438		$	13,675
	Options
	Activity for the six months ended June 30, 2014 under the stock option plans is set forth below (in thousands, except years and per share amounts):
		Stock Options			Weighted				Weighted Average		Aggregate
		Number of Shares			Average				Remaining		Intrinsic
		Underlying			Exercise				Contractual Term		Value
		Stock Options			Price per Share
									(in years )
	Outstanding as of December 31, 2013	1,321			$	16.08
	Granted	—			—
	Exercised	(514	)		17.08
	Cancelled or expired	(2	)		24.47
	Outstanding as of June 30, 2014	805			$	15.41			3.34		$	32,704
	Vested and expected to vest at June 30, 2014	804			$	15.41			3.34		$	32,662
	Exercisable at June 30, 2014	760			$	15.04			3.31		$	31,167
	There were no stock options granted during the three and six months ended June 30, 2014 and 2013.
	As of June 30, 2014, the total unamortized compensation cost related to stock options, net of estimated forfeitures, is $0.5 million, which we expect to recognize over a weighted average period of 0.8 years.
	Restricted Stock Units (“RSU”)
	A summary of the RSU activity for the six months ended June 30, 2014 is as follows (in thousands, except years):
		Number of Shares			Weighted Remaining		Aggregate
		Underlying RSU			Contractual Period		Intrinsic Value
					(in years)
	Nonvested as of December 31, 2013	2,044
	Granted	943
	Vested and released	(580	)
	Forfeited	(111	)
	Nonvested as of June 30, 2014	2,296			1.71		$	128,685
	As of June 30, 2014, the total unamortized compensation cost related to RSU, net of estimated forfeitures, was $78.1 million, which we expect to recognize over a weighted average period of 2.7 years.
	We have granted market-performance based restricted stock units (“MSU”) to our executive officers. Each MSU represents the right to one share of Align’s common stock and will be issued through our amended 2005 Incentive Plan. The actual number of MSU which will be eligible to vest will be based on the performance of Align’s stock price relative to the performance of the NASDAQ Composite Index over the vesting period, generally two to three years, up to 150% of the MSU initially granted.
	The following table summarizes the MSU activity for the six months ended June 30, 2014 (in thousands, except years):
		Number of Shares			Weighted Average		Aggregate
		Underlying MSU			Remaining		Intrinsic Value
					Contractual Period
					(in years )
	Nonvested as of December 31, 2013	307
	Granted	243
	Vested and released	(52	)
	Forfeited	—
	Nonvested as of June 30, 2014	498			1.88		$	27,880
	As of June 30, 2014, the total unamortized compensation costs related to the MSU, net of estimated forfeitures, was $13.2 million, which we expect to recognize over a weighted average period of 1.9 years.
	Employee Stock Purchase Plan ("ESPP")
	In May 2010, our stockholders approved the 2010 Employee Stock Purchase Plan ("2010 Purchase Plan") which will continue until terminated by either the Board of Directors or its administrator. The maximum number of shares available for purchase under the 2010 Purchase Plan is 2,400,000 shares. As of June 30, 2014, there remains 1,475,372 shares available for purchase under the 2010 Purchase Plan.
	The fair value of the option component of the 2010 Purchase Plan shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
		Six Months Ended June 30,
		2014				2013
	ESPP:
	Expected term (in years)	1.2				1.2
	Expected volatility	42.3		%		46.7		%
	Risk-free interest rate	0.17		%		0.18		%
	Expected dividends	—				—
	Weighted average fair value at grant date	$	17.97			$	11.17
	There were no new ESPP cycles that started during the three months ended June 30, 2014 or June 30, 2013.
As of June 30, 2014, the total unamortized compensation cost related to employee purchases was $1.3 million, which we expect to recognize over a weighted average period of 0.4 year.

Common_Stock_Repurchase_Progra

Common Stock Repurchase Program	6 Months Ended
	Jun. 30, 2014
Share Repurchase Program Disclosure [Text Block]	'
	Common Stock Repurchase
	On April 23, 2014, we announced that our Board of Directors had authorized a stock repurchase program pursuant to which we may purchase up to $300.0 million of our common stock over the next three years, with $100.0 million of that amount authorized to be purchased over the first twelve months. Any purchases under this stock repurchase program may be made, from time-to-time, pursuant to open market purchases (including pursuant to Rule 10b5-1 plans), privately-negotiated transactions, accelerated stock repurchases, block trades or derivative contracts or otherwise in accordance with applicable federal securities laws, including Rule 10b-18 of the Securities Exchange Act of 1934.
	As part of our $300.0 million stock repurchase program, we entered into an accelerated share repurchase agreement ("ASR") with Goldman, Sachs & Co. on April 28, 2014 to repurchase $70.0 million of our common stock. We paid $70.0 million on April 29, 2014 and received an initial delivery of approximately 1.0 million shares based on the then current market price of $49.17, which were retired. The remaining $21.0 million was recorded as an equity forward contract and was included in Additional paid-in capital in stockholder's equity in the Condensed balance sheet as of June 30, 2014. The final number of shares to be repurchased is based on our volume-weighted average stock price during the term of the transaction, less an agreed upon discount.
	The ASR was completed on July 29, 2014 with a final delivery of approximately 0.4 million shares. We will have received a total of approximately 1.4 million million shares under the ASR for an average purchase share price of $51.46.

Accounting_for_Income_Taxes

Accounting for Income Taxes	6 Months Ended
	Jun. 30, 2014
Accounting for Income Taxes	'
	Accounting for Income Taxes
	Our provision for income taxes was $13.0 million and $8.2 million for the three months ended June 30, 2014 and 2013, respectively. This represents effective tax rates of 26.8% and 22.0%, respectively. The increase in our provision for income taxes was primarily due to higher pre-tax income and a negative impact from a $2.1 million adjustment related to prior periods. These were offset partially by a jurisdictional shift in forecasted earnings from the U.S. to lower-tax non-U.S. jurisdictions.
	Our provision for income taxes was $23.0 million and $11.2 million for the six months ended June 30, 2014 and 2013, respectively. This represents effective tax rates of 25.3% and (745.9)%, respectively. The increase in our provision for income taxes was primarily due to higher pre-tax income and a negative impact from a $1.8 million adjustment related to prior years. These were offset partially by a jurisdictional shift in forecasted earnings from the U.S. to lower-tax non-U.S. jurisdictions. The effective tax rate for the six months ended June 30, 2013 reflects a non-deductible goodwill impairment charge of $40.7 million recorded during the three months ended March 31, 2013.
	We exercise significant judgment in regards to estimates of future market growth, forecasted earnings and projected taxable income in determining the provision for income taxes, and for purposes of assessing our ability to utilize any future benefit from deferred tax assets.
	As of June 30, 2014, we maintained a valuation allowance of $35.4 million against deferred tax assets primarily related to foreign net operating loss carryforwards and capital loss carryforwards. These net operating and capital loss carryforwards would result in an income tax benefit if we were to conclude it is more likely than not that the related deferred tax assets will be realized.
	During the three months ended June 30, 2014, the change in our gross unrecognized tax benefits was not material. The total amount of gross unrecognized tax benefits was $29.5 million as of June 30, 2014, all of which would impact our effective tax rate if recognized. We have elected to recognize interest and penalties related to unrecognized tax benefits as a component of income taxes. The change in accrued interest and penalties during the three months ended June 30, 2014 was not material. We do not expect any significant changes to the amount of unrecognized tax benefit within the next twelve months.
	During the first quarter of 2014, we adopted ASU 2013-11, "Presentation of an Unrecognized Tax Benefit when a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the FASB Emerging Issues Task Force)." The adoption of this standard had the effect of reducing our accruals for uncertain tax positions by $8.4 million, with an offsetting reduction in our long term deferred tax assets, but had no effect on net income.
	We are subject to taxation in the U.S. and various states and foreign jurisdictions. All of our tax years will be open to examination by the U.S. federal and most state tax authorities due to our net operating loss and overall credit carryforward position. With few exceptions, we are no longer subject to examination by foreign tax authorities for years before 2006.
	In June 2009, the Costa Rica Ministry of Foreign Trade, an agency of the Government of Costa Rica, granted a twelve year extension of certain income tax incentives, which were previously granted in 2002. The incentive tax rates will expire in various years beginning in 2017. Under these incentives, all of the income in Costa Rica during these twelve year incentive periods is subject to reduced rate of Costa Rica income tax. In order to receive the benefit of these incentives, we must hire specified numbers of employees and maintain certain minimum levels of fixed asset investment in Costa Rica. If we do not fulfill these conditions for any reason, our incentive could lapse, and our income in Costa Rica would be subject to taxation at higher rates, which could have a negative impact on our operating results. The Costa Rica corporate income tax rate that would apply, absent the incentives, is 30% for 2014. As a result of these incentives, our income taxes were reduced by $15.1 million and $12.0 million for the six months ended June 30, 2014 and 2013, respectively, representing a benefit to diluted net income per share of $0.18 and $0.15 in 2014 and 2013, respectively. For the three months ended June 30, 2014 and 2013, the income taxes was reduced by$7.5 million and $5.9 million, respectively, representing a benefit to diluted net income per share of $0.09 and $0.07, respectively.

Net_Profit_Per_Share

Net Profit Per Share	6 Months Ended
	Jun. 30, 2014
Net Profit Per Share	'
	Net Income (Loss) Per Share
	Basic net income (loss) per share is computed using the weighted average number of shares of common stock outstanding during the period. Diluted net income (loss) per share is computed using the weighted average number of shares of common stock, adjusted for any dilutive effect of potential common stock. Potential common stock, computed using the treasury stock method, includes stock options, RSU, MSU and ESPP.
	The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stock (in thousands, except per share amounts):
		Three Months Ended,				Six Months Ended,
		June 30,				June 30,
		2014		2013		2014		2013
	Numerator:
	Net income (loss)	$	35,600	$	29,320	$	68,044	$	(12,663	)
	Denominator:
	Weighted-average common shares outstanding, basic	81,027		80,576		81,073		80,909
	Dilutive effect of potential common stock	1,314		1,573		1,578		—
	Total shares, diluted	82,341		82,149		82,651		80,909
	Net income (loss) per share, basic	$	0.44	$	0.36	$	0.84	$	(0.16	)
	Net income (loss) per share, diluted	$	0.43	$	0.36	$	0.82	$	(0.16	)
	For the three and six months ended June 30, 2014, the anti-dilutive affect from stock options, RSU, MSU and ESPP was not material.
	For the three months ended June 30, 2013, the anti-dilutive affect from stock options, RSU, MSU and ESPP was not material. For the six months ended June 30, 2013, stock options, RSU, MSU and ESPP totaling 1.8 million of potentially dilutive shares have been excluded from the total diluted shares because there was a net loss during the period.

Segments_and_Geographical_Info

Segments and Geographical Information	6 Months Ended
	Jun. 30, 2014
Segments and Geographical Information	'
	Segments and Geographical Information
	Segment Information
	Operating segments are defined as components of an enterprise for which separate financial information is available that is evaluated regularly by the Chief Operating Decision Maker (“CODM”), or decision-making group, in deciding how to allocate resources and in assessing performance. Our CODM is our Chief Executive Officer. We report segment information based on the management approach. The management approach designates the internal reporting used by CODM for decision making and performance assessment as the basis for determining our reportable segments. The performance measures of our reportable segments include net revenues and gross profit.
	We have grouped our operations into two reportable segments which are also our reporting units: Clear Aligner segment and Scanner segment.
	•	Our Clear Aligner segment consists of our Invisalign system which includes Invisalign Full, Express/Lite, Teen, Assist, Vivera retainers, along with our training and ancillary products for treating malocclusion.
	•	Our Scanner segment consists of intra-oral scanning systems and additional services available with the intra-oral scanners that provide digital alternatives to the traditional cast models. This segment includes our iTero scanner and OrthoCAD services.
	These reportable operating segments are based on how our CODM views and evaluates our operations as well as allocation of resources. The following information relates to these segments (in thousands):
		For the Three Months Ended June 30,				For the Six Months Ended June 30,
	Net Revenues	2014		2013		2014		2013
	Clear Aligner
	Invisalign Full Products	$	147,158	$	123,379	$	285,291	$	236,159
	Invisalign Express/Lite Products	20,478		19,158		40,103		35,241
	Invisalign non-case revenues	12,099		10,766		22,580		23,475
	Scanner
	Scanners and Services	12,796		10,525		25,203		22,533
	Total net revenues	$	192,531	$	163,828	$	373,177	$	317,408
	Gross profit
	Clear Aligner	$	141,703	$	120,124	$	274,786	$	229,451
	Scanners and Services	3,773		3,567		7,941		7,089
	Total gross profit	$	145,476	$	123,691	$	282,727	$	236,540
	Geographical Information
	Net revenues are presented below by geographic area (in thousands):
		For the Three Months Ended June 30,				For the Six Months Ended June 30,
		2014		2013		2014		2013
	Net revenues: (1)
	U.S.	$	133,954	$	121,651	$	262,593	$	241,692
	the Netherlands	43,680		32,363		82,523		63,458
	Other international	14,897		9,814		28,061		12,258
	Total net revenues	$	192,531	$	163,828	$	373,177	$	317,408
	(1) Net revenues are attributed to countries based on location of where revenue is recognized.
	Tangible long-lived assets are presented below by geographic area (in thousands):
		June 30,		December 31,
		2014		2013
	Long-lived assets:(2)
	United States	$	67,386	$	61,439
	Mexico	6,184		6,291
	the Netherlands	1,297		1,630
	Other International	6,445		6,383
	Total long-lived assets	$	81,312	$	75,743
	(2) Long-lived assets are attributed to countries based on entity that owns the asset.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Basis of presentation	'
	Basis of presentation
	The accompanying unaudited Condensed Consolidated Financial Statements have been prepared by Align Technology, Inc. (“we”, “our”, or “Align”) in accordance with the rules and regulations of the Securities and Exchange Commission ("SEC") and contain all adjustments, including normal recurring adjustments, necessary to present fairly our results of operations for the three and six months ended June 30, 2014 and 2013, our comprehensive income (loss) for the three and six months ended June 30, 2014 and 2013, our financial position as of June 30, 2014 and our cash flows for the six months ended June 30, 2014 and 2013. The Condensed Consolidated Balance Sheet as of December 31, 2013 was derived from the December 31, 2013 audited financial statements. Net revenues by geographic area for prior period amounts in Note 13 have been reclassified to conform with the current period presentation. These reclassifications had no impact on our financial position for the three or six months ended June 30, 2014 and 2013.
	The results of operations for the three months ended June 30, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014 or any other future period, and we make no representations related thereto. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” “Quantitative and Qualitative Disclosures About Market Risk” and the Consolidated Financial Statements and notes thereto included in Items 7, 7A and 8, respectively, in our Annual Report on Form 10-K for the year ended December 31, 2013.
Use of estimates	'
	Use of estimates
	The preparation of financial statements in conformity with generally accepted accounting principles ("GAAP") in the United States of America (“U.S.”) requires our management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. On an ongoing basis, we evaluate our estimates, including those related to the fair values of financial instruments, long-lived assets and goodwill, useful lives of intangible assets and property and equipment, stock-based compensation, income taxes, and contingent liabilities, among others. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-09, “Revenue from Contracts with Customers,” requiring an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective and permits the use of either the retrospective or cumulative effect transition method. Early adoption is not permitted. The updated standard becomes effective for us in the first quarter of fiscal 2017. We have not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures.

Marketable_Securities_and_Fair1

Marketable Securities and Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Short-Term And Long-Term Marketable Securities	'
	s of June 30, 2014 and December 31, 2013, the estimated fair value of our short-term and long-term marketable securities, classified as available for sale, are as follows (in thousands):
	Short-term
	June 30, 2014	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Commercial paper	$	51,103	$	—	$	—		$	51,103
	Corporate bonds	88,333		55		(16		)	88,372
	U.S. government agency bonds	22,729		7		(1		)	22,735
	Asset-backed securities	14,341		10		—			14,351
	Municipal securities	11,663		24		—			11,687
	U.S. dollar dominated foreign corporate bonds	921		4		—			925
	U.S. government treasury bonds	8,876		10		—			8,886
	Total Marketable Securities, Short-Term	$	197,966	$	110	$	(17	)	$	198,059
	Long-term
	June 30, 2014	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Corporate bonds	$	62,996	$	34	$	(36	)	$	62,994
	U.S. government agency bonds	31,025		26		—			31,051
	Asset-backed securities	20,330		11		(8		)	20,333
	U.S. government treasury bonds	16,269		16		—			16,285
	Municipal securities	6,470		15		—			6,485
	Total Marketable Securities, Long-Term	$	137,090	$	102	$	(44	)	$	137,148
	Short-term
	December 31, 2013	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	Commercial paper	$	54,318	$	10	$	—		$	54,328
	Corporate bonds	29,079		10		(4		)	29,085
	U.S. government agency bonds	16,693		10		—			16,703
	U.S. dollar dominated foreign corporate bonds	13,959		12		—			13,971
	Municipal securities	7,006		11		(3		)	7,014
	Asset-backed securities	5,937		2		—			5,939
	Total Marketable Securities, Short-Term	$	126,992	$	55	$	(7	)	$	127,040
	Long-term
	31-Dec-13	Amortized		Gross		Gross			Fair Value
		Cost		Unrealized		Unrealized
				Gains		Losses
	U.S. government agency bonds	$	38,138	$	1	$	(21	)	$	38,118
	Corporate bonds	23,308		14		(9		)	23,313
	U.S. dollar dominated foreign corporate bonds	19,485		27		(17		)	19,495
	Municipal securities	8,326		13		(8		)	8,331
	U.S. government treasury bonds	6,916		3		—			6,919
	Asset-backed securities	5,800		4		(2		)	5,802
	Total Marketable Securities, Long-Term	$	101,973	$	62	$	(57	)	$	101,978
Investments Classified by Contractual Maturity Date [Table Text Block]	'
	As the carrying value approximates the fair value for our short-term and long-term marketable securities shown in the tables above, the following table summarizes the fair value of our short-term and long-term marketable securities classified by maturity as of June 30, 2014 and December 31, 2013 (in thousands):
		June 30,		December 31,
		2014		2013
	Due in one year or less	$	198,059	$	127,040
	Due in one year to 27 months	137,148		101,978
	Total available for sale short-term and long-term marketable securities	$	335,207	$	229,018
Financial Assets Measured At Fair Value On Recurring Basis	'
	The following table summarizes our financial assets measured at fair value on a recurring basis as of June 30, 2014 and December 31, 2013 (in thousands):
	Description	Balance as of		Quoted Prices in		Significant Other
		30-Jun-14		Active  Markets for		Observable  Inputs
				Identical Assets		(Level 2)
				(Level 1)
	Cash equivalents:
	Money market funds	$	59,929	$	59,929	$	—
	Commercial paper	32,244		—		32,244
	Short-term investments:
	Commercial paper	51,103		—		51,103
	Corporate bonds	88,372		—		88,372
	U.S. government agency bonds	22,735		—		22,735
	Asset-backed securities	14,351		—		14,351
	Municipal securities	11,687		—		11,687
	U.S. dollar dominated foreign corporate bonds	925		—		925
	U.S. government treasury bonds	8,886		8,886		—
	Long-term investments:
	Corporate bonds	62,994		—		62,994
	U.S. government agency bonds	31,051		—		31,051
	Asset-backed securities	20,333		—		20,333
	U.S. government treasury bonds	16,285		16,285		—
	Municipal securities	6,485		—		6,485
	Other assets:
	Israeli funds	2,434		—		2,434
		$	429,814	$	85,100	$	344,714
	Description	Balance as of		Quoted Prices in		Significant Other
		December 31, 2013		Active  Markets for		Observable  Inputs
				Identical Assets		(Level 2)
				(Level 1)
	Cash equivalents:
	Money market funds	$	143,540	$	143,540	$	—
	Commercial paper	15,398		—		15,398
	Short-term investments:
	Commercial paper	54,328		—		54,328
	Corporate bonds	29,085		—		29,085
	U.S. dollar denominated foreign corporate bonds	13,971		—		13,971
	U.S. government agency bonds	16,703		—		16,704
	Municipal securities	7,014		—		7,014
	Asset-backed securities	5,939		—		5,938
	Long-term investments:
	U.S. government agency bonds	38,118		—		38,118
	Corporate bonds	23,313		—		23,313
	U.S. dollar denominated foreign corporate bonds	19,495		—		19,495
	Municipal securities	8,331		—		8,331
	U.S. government treasury bonds	6,919		6,919		—
	Asset-backed securities	5,802		—		5,802
	Other assets:
	Israeli funds	2,193		—		2,193
		$	390,149	$	150,459	$	239,690

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule of Inventories	'
	Inventories consist of the following (in thousands):
		June 30,			December 31,
		2014			2013
	Raw materials	$	3,493		$	5,172
	Work in process	3,430			4,241
	Finished goods	6,192			4,555
	Total Inventories	$	13,115		$	13,968
Schedule of Accrued Liabilities	'
	Accrued liabilities consist of the following (in thousands):
		June 30,			December 31,
		2014			2013
	Accrued payroll and benefits	$	43,332		$	43,029
	Accrued sales rebates	10,137			10,100
	Accrued sales tax and value added tax	6,447			6,215
	Accrued sales and marketing expenses	4,488			3,893
	Accrued accounts payable	2,504			4,053
	Accrued warranty	3,252			3,104
	Accrued professional fees	1,872			1,892
	Accrued income taxes	2,248			1,205
	Other accrued liabilities	6,769			6,854
	Total Accrued Liabilities	$	81,049		$	80,345
Warranty Accrual	'
	Warranty accrual as of June 30, 2014 and 2013 consists of the following activity (in thousands):
		Six Months Ended June 30,
		2014			2013
	Balance at beginning of period	$	3,104		$	4,050
	Charged to cost of net revenues	1,195			2,784
	Actual warranty expenditures	(1,047		)	(2,381		)
	Balance at end of period	$	3,252		$	4,453

Goodwill_and_Longlived_Assets_

Goodwill and Long-lived Assets (Tables)	6 Months Ended
	Jun. 30, 2014
Notes To Financial Statements [Abstract]	'
Summary of Goodwill by Reportable Segment	'
	The change in the carrying value of goodwill for the six months ended June 30, 2014 by our reportable segments, which are also our reporting units, is as follows (in thousands):
		Clear Aligner
	Balance as of December 31, 2013	$	61,623
	Adjustments 1	184
	Balance as of June 30, 2014	$	61,807
Schedule Of Amortized Intangible Assets	'
	Intangible assets arising either as a direct result from the Cadent Holdings, Inc. acquisition ("Cadent") or individually acquired are being amortized as follows (in thousands):
		Weighted Average Amortization Period (in years)		Gross Carrying Amount as of		Accumulated			Accumulated			Net Carrying
				June 30, 2014		Amortization			Impairment Loss			Value as of
												30-Jun-14
	Trademarks	15		$	7,100	$	(1,285	)	$	(4,179	)	$	1,636
	Existing technology	13		12,600		(2,732		)	(4,328		)	5,540
	Customer relationships	11		33,500		(8,164		)	(10,751		)	14,585
	Other	8		285		(58		)	—			227
	Total Intangible Assets			$	53,485	$	(12,239	)	$	(19,258	)	$	21,988
		Weighted Average Amortization Period (in years)		Gross Carrying		Accumulated			Accumulated Impairment Loss			Net Carrying
				Amount as of		Amortization						Value as of
				31-Dec-13								December 31, 2013
	Trademarks	15		$	7,100	$	(1,100	)	$	(4,179	)	$	1,821
	Existing technology	13		12,600		(2,236		)	(4,328		)	6,036
	Customer relationships	11		33,500		(7,112		)	(10,751		)	15,637
	Other	8		285		(40		)	—			245
	Total Intangible Assets			$	53,485	$	(10,488	)	$	(19,258	)	$	23,739
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	'
	The total estimated annual future amortization expense for these acquired intangible assets as of June 30, 2014 is as follows (in thousands):
	Fiscal Year Ending December 31,
	Remainder of 2014	$	1,300
	2015	2,600
	2016	2,600
	2017	2,600
	2018	2,600
	Thereafter	10,288
	Total	$	21,988

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2014
Notes To Financial Statements [Abstract]	'
Schedule of Future Lease Payments	'
	As of June 30, 2014, minimum future lease payments for non-cancelable operating leases are as follows (in thousands):
	Fiscal Year Ending December 31,	Operating leases
	Remainder of 2014	$	4,598
	2015	8,494
	2016	7,770
	2017	4,471
	2018	1,525
	Thereafter	494
	Total minimum future lease payments	$	27,352

Stockbased_Compensation_Tables

Stock-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2014
Stock-based Compensation Expense	'
	The stock-based compensation related to all of our stock-based awards and employee stock purchases for the three and six months ended June 30, 2014 and 2013 is as follows (in thousands):
		Three Months Ended								Six Months Ended
		June 30,								June 30,
		2014				2013				2014			2013
	Cost of net revenues	$	937			$	637			$	1,781		$	1,217
	Sales and marketing	3,111				2,012				5,778			3,023
	General and administrative	4,539				3,556				8,589			7,483
	Research and development	1,719				1,060				3,290			1,952
	Total stock-based compensation	$	10,306			$	7,265			$	19,438		$	13,675
Stock Option Activity	'														[1]
	Activity for the six months ended June 30, 2014 under the stock option plans is set forth below (in thousands, except years and per share amounts):
		Stock Options			Weighted				Weighted Average		Aggregate
		Number of Shares			Average				Remaining		Intrinsic
		Underlying			Exercise				Contractual Term		Value
		Stock Options			Price per Share
									(in years )
	Outstanding as of December 31, 2013	1,321			$	16.08
	Granted	—			—
	Exercised	(514	)		17.08
	Cancelled or expired	(2	)		24.47
	Outstanding as of June 30, 2014	805			$	15.41			3.34		$	32,704
	Vested and expected to vest at June 30, 2014	804			$	15.41			3.34		$	32,662
	Exercisable at June 30, 2014	760			$	15.04			3.31		$	31,167
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions	'
	The fair value of the option component of the 2010 Purchase Plan shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
		Six Months Ended June 30,
		2014				2013
	ESPP:
	Expected term (in years)	1.2				1.2
	Expected volatility	42.3		%		46.7		%
	Risk-free interest rate	0.17		%		0.18		%
	Expected dividends	—				—
	Weighted average fair value at grant date	$	17.97			$	11.17
Restricted Stock Units (RSUs)	'
Summary Of Nonvested Shares	'
	A summary of the RSU activity for the six months ended June 30, 2014 is as follows (in thousands, except years):
		Number of Shares			Weighted Remaining		Aggregate
		Underlying RSU			Contractual Period		Intrinsic Value
					(in years)
	Nonvested as of December 31, 2013	2,044
	Granted	943
	Vested and released	(580	)
	Forfeited	(111	)
	Nonvested as of June 30, 2014	2,296			1.71		$	128,685
Market Performance Based Restricted Stock Units	'
Summary Of Nonvested Shares	'
	The following table summarizes the MSU activity for the six months ended June 30, 2014 (in thousands, except years):
		Number of Shares			Weighted Average		Aggregate
		Underlying MSU			Remaining		Intrinsic Value
					Contractual Period
					(in years )
	Nonvested as of December 31, 2013	307
	Granted	243
	Vested and released	(52	)
	Forfeited	—
	Nonvested as of June 30, 2014	498			1.88		$	27,880
[1]	There were no stock options granted during the three and six months ended JuneB 30, 2014 and 2013.

Net_Profit_Per_Share_Tables

Net Profit Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule Of Earnings Per Share Basic And Diluted	'
	The following table sets forth the computation of basic and diluted net income (loss) per share attributable to common stock (in thousands, except per share amounts):
		Three Months Ended,				Six Months Ended,
		June 30,				June 30,
		2014		2013		2014		2013
	Numerator:
	Net income (loss)	$	35,600	$	29,320	$	68,044	$	(12,663	)
	Denominator:
	Weighted-average common shares outstanding, basic	81,027		80,576		81,073		80,909
	Dilutive effect of potential common stock	1,314		1,573		1,578		—
	Total shares, diluted	82,341		82,149		82,651		80,909
	Net income (loss) per share, basic	$	0.44	$	0.36	$	0.84	$	(0.16	)
	Net income (loss) per share, diluted	$	0.43	$	0.36	$	0.82	$	(0.16	)

Segments_and_Geographical_Info1

Segments and Geographical Information (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	'
	These reportable operating segments are based on how our CODM views and evaluates our operations as well as allocation of resources. The following information relates to these segments (in thousands):
		For the Three Months Ended June 30,				For the Six Months Ended June 30,
	Net Revenues	2014		2013		2014		2013
	Clear Aligner
	Invisalign Full Products	$	147,158	$	123,379	$	285,291	$	236,159
	Invisalign Express/Lite Products	20,478		19,158		40,103		35,241
	Invisalign non-case revenues	12,099		10,766		22,580		23,475
	Scanner
	Scanners and Services	12,796		10,525		25,203		22,533
	Total net revenues	$	192,531	$	163,828	$	373,177	$	317,408
	Gross profit
	Clear Aligner	$	141,703	$	120,124	$	274,786	$	229,451
	Scanners and Services	3,773		3,567		7,941		7,089
	Total gross profit	$	145,476	$	123,691	$	282,727	$	236,540
	Geographical Information
	Net revenues are presented below by geographic area (in thousands):
		For the Three Months Ended June 30,				For the Six Months Ended June 30,
		2014		2013		2014		2013
	Net revenues: (1)
	U.S.	$	133,954	$	121,651	$	262,593	$	241,692
	the Netherlands	43,680		32,363		82,523		63,458
	Other international	14,897		9,814		28,061		12,258
	Total net revenues	$	192,531	$	163,828	$	373,177	$	317,408
	(1) Net revenues are attributed to countries based on location of where revenue is recognized.
	Tangible long-lived assets are presented below by geographic area (in thousands):
		June 30,		December 31,
		2014		2013
	Long-lived assets:(2)
	United States	$	67,386	$	61,439
	Mexico	6,184		6,291
	the Netherlands	1,297		1,630
	Other International	6,445		6,383
	Total long-lived assets	$	81,312	$	75,743
	(2) Long-lived assets are attributed to countries based on entity that owns the asset.

ShortTerm_and_LongTerm_Marketa

Short-Term and Long-Term Marketable Securities (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Total available for sale short-term and long-term marketable securities	$335,207	$229,018
Fair Value, Measurements, Recurring [Member] | Short-term Investments	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	197,966	126,992
Gross Unrealized Gains	110	55
Gross Unrealized Losses	-17	-7
Total available for sale short-term and long-term marketable securities	198,059	127,040
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Commercial paper	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	51,103	54,318
Gross Unrealized Gains	0	10
Gross Unrealized Losses	0	0
Total available for sale short-term and long-term marketable securities	51,103	54,328
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Corporate bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	88,333	29,079
Gross Unrealized Gains	55	10
Gross Unrealized Losses	-16	-4
Total available for sale short-term and long-term marketable securities	88,372	29,085
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. government agency bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	22,729	16,693
Gross Unrealized Gains	7	10
Gross Unrealized Losses	-1	0
Total available for sale short-term and long-term marketable securities	22,735	16,703
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Asset-backed securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	14,341	5,937
Gross Unrealized Gains	10	2
Gross Unrealized Losses	0	0
Total available for sale short-term and long-term marketable securities	14,351	5,939
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Municipal securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	11,663	7,006
Gross Unrealized Gains	24	11
Gross Unrealized Losses	0	-3
Total available for sale short-term and long-term marketable securities	11,687	7,014
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. dollar dominated foreign corporate bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	921	13,959
Gross Unrealized Gains	4	12
Gross Unrealized Losses	0	0
Total available for sale short-term and long-term marketable securities	925	13,971
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. government treasury bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	8,876	'
Gross Unrealized Gains	10	'
Gross Unrealized Losses	0	'
Total available for sale short-term and long-term marketable securities	8,886	'
Fair Value, Measurements, Recurring [Member] | Long-term Investments	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	137,090	101,973
Gross Unrealized Gains	102	62
Gross Unrealized Losses	-44	-57
Total available for sale short-term and long-term marketable securities	137,148	101,978
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Corporate bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	62,996	23,308
Gross Unrealized Gains	34	14
Gross Unrealized Losses	-36	-9
Total available for sale short-term and long-term marketable securities	62,994	23,313
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. government agency bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	31,025	38,138
Gross Unrealized Gains	26	1
Gross Unrealized Losses	0	-21
Total available for sale short-term and long-term marketable securities	31,051	38,118
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Asset-backed securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	20,330	5,800
Gross Unrealized Gains	11	4
Gross Unrealized Losses	-8	-2
Total available for sale short-term and long-term marketable securities	20,333	5,802
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Municipal securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	6,470	8,326
Gross Unrealized Gains	15	13
Gross Unrealized Losses	0	-8
Total available for sale short-term and long-term marketable securities	6,485	8,331
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. dollar dominated foreign corporate bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	'	19,485
Gross Unrealized Gains	'	27
Gross Unrealized Losses	'	-17
Total available for sale short-term and long-term marketable securities	'	19,495
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. government treasury bonds	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	16,269	6,916
Gross Unrealized Gains	16	3
Gross Unrealized Losses	0	0
Total available for sale short-term and long-term marketable securities	$16,285	$6,919

Summary_of_Financial_Assets_Me

Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	$335,207,000	$229,018,000
Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure	429,814,000	390,149,000
Fair Value, Measurements, Recurring [Member] | Israeli Severance Funds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Other assets	2,434,000	2,193,000
Fair Value, Measurements, Recurring [Member] | Cash Equivalents | Money market funds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Cash equivalents	59,929,000	143,540,000
Fair Value, Measurements, Recurring [Member] | Cash Equivalents | Commercial paper	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Cash equivalents	32,244,000	15,398,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	198,059,000	127,040,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Commercial paper	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	51,103,000	54,328,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	88,372,000	29,085,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. dollar dominated foreign corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	925,000	13,971,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. government agency bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	22,735,000	16,703,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Foreign bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	925,000	'
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. government treasury bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	8,886,000	'
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Municipal securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	11,687,000	7,014,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | US Government Agency Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	22,735,000	16,703,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Asset-backed securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	14,351,000	5,939,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	137,148,000	101,978,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	62,994,000	23,313,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. dollar dominated foreign corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	19,495,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. government agency bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	31,051,000	38,118,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Foreign bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	19,495,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. government treasury bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	16,285,000	6,919,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Municipal securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	6,485,000	8,331,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | US Government Agency Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	6,919,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Asset-backed securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	20,333,000	5,802,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure	85,100,000	150,459,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Israeli Severance Funds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Other assets	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash Equivalents | Money market funds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Cash equivalents	59,929,000	143,540,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash Equivalents | Commercial paper	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | Commercial paper	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | Corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | U.S. dollar dominated foreign corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | Foreign bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | U.S. government treasury bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	8,886,000	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | Municipal securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | US Government Agency Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | Asset-backed securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | Corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | U.S. government agency bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | Foreign bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | U.S. government treasury bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	16,285,000	'
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | Municipal securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | US Government Agency Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	6,919,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments | Asset-backed securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets, Fair Value Disclosure	344,714,000	239,690,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Israeli Severance Funds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Other assets	2,434,000	2,193,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Cash Equivalents | Money market funds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Cash equivalents	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Cash Equivalents | Commercial paper	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Cash equivalents	32,244,000	15,398,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | Commercial paper	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	51,103,000	54,328,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | Corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	88,372,000	29,085,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | U.S. dollar dominated foreign corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	13,971,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | Foreign bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	925,000	'
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | U.S. government treasury bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	'
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | Municipal securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	11,687,000	7,014,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | US Government Agency Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	22,735,000	16,704,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | Asset-backed securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	14,351,000	5,938,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-term Investments | Corporate bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	62,994,000	23,313,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-term Investments | U.S. government agency bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	31,051,000	38,118,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-term Investments | Foreign bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	19,495,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-term Investments | U.S. government treasury bonds	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	0	'
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-term Investments | Municipal securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	6,485,000	8,331,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-term Investments | US Government Agency Bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	'	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-term Investments | Asset-backed securities	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Investments	$20,333,000	$5,802,000

Marketable_Securities_and_Fair2

Marketable Securities and Fair Value Measurements Additional Information (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'	'	'
Maturity Period Used To Classify Investments	'	'	'	'27 months	'	'
Marketable Securities, Weighted Average Remaining Maturity	'	'	'	'10 months	'	'10 months
Asset Impairment Charges	$26,300	$0	$0	$0	$26,320	'
Impairment of goodwill	'	$0	$0	$0	$40,693	'

Marketable_Securities_and_Fair3

Marketable Securities and Fair Value Measurements Available For Sale Securities (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Due in one year or less	$198,059	$127,040
Due in one year to 27 months	137,148	101,978
Total available for sale short-term and long-term marketable securities	$335,207	$229,018

Inventories_Details

Inventories (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Inventory [Line Items]	'	'
Raw materials	$3,493	$5,172
Work in process	3,430	4,241
Finished goods	6,192	4,555
Total Inventories	$13,115	$13,968

Accrued_Liabilities_Details

Accrued Liabilities (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Accrued Liabilities [Line Items]	'	'
Accrued payroll and benefits	$43,332	$43,029
Accrued sales rebate	10,137	10,100
Accrued sales tax and value added tax	6,447	6,215
Accrued sales and marketing expenses	4,488	3,893
Accrued accounts payable	2,504	4,053
Accrued warranty	3,252	3,104
Accrued professional fees	1,872	1,892
Accrued income taxes	2,248	1,205
Other accrued liabilities	6,769	6,854
Total Accrued Liabilities	$81,049	$80,345

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Details)	6 Months Ended
	Jun. 30, 2014
Product Information [Line Items]	'
Scanners, Warranty period	'1 year

Warranty_Accrual_Activity_Deta

Warranty Accrual Activity (Details) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]	'	'
Balance at beginning of period	$3,104	$4,453
Charged to cost of revenues	1,195	'
Actual warranty expenditures	-1,047	'
Balance at end of period	$3,252	$4,453

Business_Combinations_Details

Business Combinations (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Apr. 30, 2013
			ICA Holdings Pty Limited [Member]
Business Acquisition [Line Items]	'	'	'
Payments to acquire business	'	'	$8,600,000
Assets acquired	'	'	7,400,000
Liabilities assumed	'	'	2,400,000
Goodwill	$83,795,000	$85,362,000	$3,600,000

Change_in_Carrying_Value_of_Go

Change in Carrying Value of Goodwill (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014
In Thousands, unless otherwise specified			Clear Aligner [Member]
Goodwill [Roll Forward]	'	'	'
Balance as of December 31, 2013	$83,795	$85,362	$61,623
Adjustments 1	'	'	184	[1]
Balance as of June 30, 2014	$83,795	$85,362	$61,807
[1]	The adjustments to goodwill during theB sixB months endedB JuneB 30, 2014 were due to foreign currency translation.

Intangible_Assets_as_Direct_Re

Intangible Assets as Direct Result from Cadent Acquisition (Details) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount, beginning balance	$53,485	$53,485
Accumulated Amortization	-12,239	-10,488
Accumulated Impairment Loss	-19,258	-19,258
Net Carrying Value, ending balance	21,988	23,739
Trademarks	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount, beginning balance	7,100	7,100
Accumulated Amortization	-1,285	-1,100
Accumulated Impairment Loss	-4,179	-4,179
Net Carrying Value, ending balance	1,636	1,821
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	'15 years	'15 years
Existing technology	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount, beginning balance	12,600	12,600
Accumulated Amortization	-2,732	-2,236
Accumulated Impairment Loss	-4,328	-4,328
Net Carrying Value, ending balance	5,540	6,036
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	'13 years	'13 years
Customer relationships	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount, beginning balance	33,500	33,500
Accumulated Amortization	-8,164	-7,112
Accumulated Impairment Loss	-10,751	-10,751
Net Carrying Value, ending balance	14,585	15,637
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	'11 years	'11 years
Other	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount, beginning balance	285	285
Accumulated Amortization	-58	-40
Accumulated Impairment Loss	0	0
Net Carrying Value, ending balance	$227	$245
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	'8 years	'8 years

Total_Estimated_Annual_Future_

Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Expected Amortization Expense [Line Items]	'	'
Remainder of 2014	$1,300	'
2015	2,600	'
2016	2,600	'
2017	2,600	'
2018	2,600	'
Thereafter	10,288	'
Net Carrying Value, ending balance	$21,988	$23,739

Goodwill_and_Longlived_Assets_1

Goodwill and Long-lived Assets Impairment of goodwill (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Goodwill [Line Items]	'	'	'	'	'
Impairment of goodwill	'	$0	$0	$0	$40,693,000
Asset Impairment Charges	26,300,000	0	0	0	26,320,000
Scanners and CAD/CAM Services	'	'	'	'	'
Goodwill [Line Items]	'	'	'	'	'
Asset Impairment Charges	19,300,000	'	'	'	'
Property, Plant, Equipment [Member]	'	'	'	'	'
Goodwill [Line Items]	'	'	'	'	'
Impairment of fixed assets	$7,000,000	'	'	'	'

Credit_Facilities_Additional_I

Credit Facilities - Additional Information (Details) (USD $)	0 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Mar. 22, 2013	Jun. 30, 2014	Mar. 22, 2013	Jun. 30, 2014	Mar. 22, 2013
		Revolving Credit Facility [Member]	Revolving Credit Facility [Member]	Letter of Credit [Member]	Letter of Credit [Member]
		Wells Fargo [Member]	Wells Fargo [Member]	Wells Fargo [Member]	Wells Fargo [Member]
Line of Credit Facility [Line Items]	'	'	'	'	'
Line of credit, available borrowings	'	'	$50	'	$10
Unrestricted Cash Deposit	'	50	'	'	'
Debt Instrument, Basis Spread on Variable Rate	1.75%	'	'	'	'
Line of Credit Facility, Amount Outstanding	'	'	'	$0	'

Minimum_Future_Lease_Payments_

Minimum Future Lease Payments for Non-Cancelable Leases (Details) (USD $)	Jun. 30, 2014
In Thousands, unless otherwise specified
Disclosure Minimum Future Lease Payments For Non Cancelable Leases [Abstract]	'
Remainder of 2014	$4,598
2015	8,494
2016	7,770
2017	4,471
2018	1,525
Thereafter	494
Total minimum lease payments	$27,352

Stockbased_Compensation_Additi

Stock-based Compensation - Additional Information (Details) (USD $)	6 Months Ended
In Millions, except Share data, unless otherwise specified	Jun. 30, 2014
Incentive Plan 2005	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Shares reserved for issuance	23,283,379
Amended And Restated 2005 Stock Incentive Plan	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Shares reserved for issuance	5,000,000
Employee Stock Purchase Plan 2010	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Maximum number of shares available	2,400,000
Number of shares remaining	1,475,372
Restricted Stock Units (RSUs)	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Total unamortized compensation cost	78.1
Weighted average period of total unamortized cost (in years)	'2 years 8 months 24 days
Market Performance Based Restricted Stock Units	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Total unamortized compensation cost	13.2
Weighted average period of total unamortized cost (in years)	'1 year 10 months 24 days
Market Performance Based Restricted Stock Units | Minimum	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Vesting period of granted market-performance based restricted stock units	'2 years
Market Performance Based Restricted Stock Units | Maximum	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Vesting period of granted market-performance based restricted stock units	'3 years
Percentage of market-performance based restricted stock units eligible to vest over the vesting period	150.00%
Stock Options	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Total unamortized compensation cost	0.5
Weighted average period of total unamortized cost (in years)	'9 months 18 days
Employee Stock Purchase Plan	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Total unamortized compensation cost	1.3
Weighted average period of total unamortized cost (in years)	'4 months 24 days

StockBased_Compensation_Expens

Stock-Based Compensation Expense Related to All Stock-Based Awards and Employee Stock Purchases (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	$10,306	$7,265	$19,438	$13,675
Cost of Sales [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	937	637	1,781	1,217
Selling and Marketing Expense [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	3,111	2,012	5,778	3,023
General and Administrative Expense [Member]	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	4,539	3,556	8,589	7,483
Research and development	'	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'	'
Stock-based compensation expense	$1,719	$1,060	$3,290	$1,952

Activity_Under_Stock_Option_Pl

Activity Under Stock Option Plans (Details) (USD $)	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Number of Shares Underlying Stock Options	'	'
Outstanding as of December 31, 2013	1,321	'
Granted	0	'
Exercised	-514	'
Cancelled or expired	-2	'
Outstanding as of June 30, 2014	805	'
Vested and expected to vest at June 30, 2014	804	'
Exercisable at June 30, 2014	760	'
Weighted Average Exercise Price per Share	'	'
Outstanding as of June 30, 2014	$15.41	$16.08
Exercised	$17.08	'
Cancelled or expired	$24.47	'
Vested and expected to vest at June 30, 2014 (usd per share)	$15.41	'
Exercisable at June 30, 2014 (usd per share)	$15.04	'
Weighted Average Remaining Contractual Term	'	'
Outstanding as of June 30, 2014	'3 years 4 months 2 days	'
Vested and expected to vest at June 30, 2014	'3 years 4 months 2 days	'
Exercisable at June 30, 2014	'3 years 3 months 22 days	'
Aggregate Intrinsic Value	'	'
Outstanding as of June 30, 2014	$32,704	'
Vested and expected to vest at June 30, 2014	32,662	'
Exercisable at June 30, 2014	$31,167	'

Summary_of_Nonvested_Shares_De

Summary of Nonvested Shares (Details) (Restricted Stock Units (RSUs), USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Restricted Stock Units (RSUs)	'
Number of Shares Underlying RSUs	'
Nonvested as of December 31, 2013	2,044
Granted	943
Vested and released	-580
Forfeited	-111
Nonvested as of June 30, 2014	2,296
Weighted Remaining Vesting Period	'
Nonvested as of June 30, 2014	'1 year 8 months 16 days
Aggregate Intrinsic Value	'
Nonvested as of June 30, 2014	$128,685

Summary_of_MSU_Performance_Det

Summary of MSU Performance (Details) (Market Performance Based Restricted Stock Units, USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Market Performance Based Restricted Stock Units	'
Number of Shares Underlying MSUs	'
Nonvested as of December 31, 2013	307
Granted	243
Vested and released	-52
Forfeited	0
Nonvested as of June 30, 2014	498
Weighted Average Remaining Vesting Period	'
Nonvested as of June 30, 2014	'1 year 10 months 17 days
Aggregate Intrinsic Value	'
Nonvested as of June 30, 2014	$27,880

Stockbased_Compensation_Stockb

Stock-based Compensation Stock-based Compensation Employee Stock Purchase Plan (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Expected term (in years)	'1 year 2 months 12 days	'1 year 2 months 12 days
Expected volatility	42.30%	46.70%
Risk-free interest rate	0.17%	0.18%
Expected dividends	0.00%	0.00%
Weighted average fair value at grant date (USD per Share)	$17.97	$11.17

Common_Stock_Repurchase_Progra1

Common Stock Repurchase Program - Additional Information (Details) (USD $)	0 Months Ended		6 Months Ended	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Apr. 28, 2014	Apr. 23, 2014	Jun. 30, 2014	Jul. 29, 2014	Jul. 29, 2014
				Subsequent Event [Member]	Accelerated Share Repurchase Program [Member]
Share Repurchases [Line Items]	'	'	'	'	'
Repurchase of common stock, common stock authorized	'	$300	'	'	'
Stock repurchase program, authorized amount for next twelve months	'	100	'	'	'
Accelerated share repurchase, contracted amount of repurchase	70	'	'	'	'
Share Repurchase Program, Amount Paid	70	'	'	'	'
Accelerated Share Repurchase, Initial Delivery of Shares, Shares	1	'	'	'	'
Share Repurchases Price Paid Per Share	$49.17	'	'	'	$51.46
Stock Repurchase Program, Remaining Authorized Repurchase Amount	'	'	$21	'	'
Accelerated Share Repurchase Program, Final Delivery of Shares, Shares	'	'	'	0.4	'
Treasury Stock, Shares, Acquired	'	'	'	'	1.4

Accounting_for_Income_Taxes_Ad

Accounting for Income Taxes - Additional Information (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Taxes [Line Items]	'	'	'	'	'	'
Provision for income taxes	$13,039,000	'	$8,246,000	'	$23,000,000	$11,166,000
Effective income tax rate, continuing operations	26.80%	'	22.00%	'	25.30%	-745.90%
Effective income tax rate reconciliation, prior year income taxes, amount	2,100,000	'	'	'	1,800,000	'
Income tax expense (benefit), nondeductible expense, impairment losses, amount	'	'	'	40,700,000	'	'
Valuation allowance, deferred tax asset	35,400,000	'	'	'	35,400,000	'
Unrecognized tax benefits	29,500,000	'	'	'	29,500,000	'
Unrecognized tax benefits, decrease resulting from prior period tax positions	'	8,400,000	'	'	'	'
Tax holiday effect on diluted earnings per share	$0.09	'	$0.07	'	$0.18	$0.15
Foreign Tax Authority [Member]	'	'	'	'	'	'
Income Taxes [Line Items]	'	'	'	'	'	'
Foreign income tax rate	'	'	'	'	30.00%	'
Tax Holiday effect	$7,500,000	'	$5,900,000	'	$15,100,000	$12,000,000

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Net Profit Per Share Attributable to Common Stock (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:	'	'	'	'
Net profit (loss)	$35,600	$29,320	$68,044	($12,663)
Denominator:	'	'	'	'
Weighted-average common shares outstanding, basic (in shares)	81,027	80,576	81,073	80,909
Dilutive effect of potential common stock (in shares)	1,314	1,573	1,578	0
Total shares, diluted	82,341	82,149	82,651	80,909
Net profit (loss) per share, basic	$0.44	$0.36	$0.84	($0.16)
Net profit (loss) per share, diluted	$0.43	$0.36	$0.82	($0.16)

Net_Profit_per_Share_Additiona

Net Profit per Share - Additional Information (Details)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'
Antidilutive securities excluded from computation of earnings per share, amount	1.8

Segments_and_Geographical_Info2

Segments and Geographical Information - Additional Information (Details)	6 Months Ended
	Jun. 30, 2014
	segment
Disclosure Segments And Geographical Information Additional Information [Abstract]	'
Number of reportable segments	2

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Segment Reporting Information [Line Items]	'		'		'		'
Revenue	$192,531	[1]	$163,828	[1]	$373,177	[1]	$317,408	[1]
Gross profit	145,476		123,691		282,727		236,540
Clear Aligner [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Gross profit	141,703		120,124		274,786		229,451
Invisalign Full [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Revenue	147,158		123,379		285,291		236,159
Invisalign ExpressLite [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Revenue	20,478		19,158		40,103		35,241
Invisalign Non-Case Revenues [Member]	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Revenue	12,099		10,766		22,580		23,475
Scanners and CAD/CAM Services	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Revenue	12,796		10,525		25,203		22,533
Gross profit	$3,773		$3,567		$7,941		$7,089
[1]	Net revenues are attributed to countries based on location of where revenue is recognized.

Net_Revenues_by_Geographic_Are

Net Revenues by Geographic Area (Details) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	$192,531	[1]	$163,828	[1]	$373,177	[1]	$317,408	[1]
United States	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	133,954	[1]	121,651	[1]	262,593	[1]	241,692	[1]
the Netherlands	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	43,680	[1]	32,363	[1]	82,523	[1]	63,458	[1]
Other international	'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'
Net revenues	$14,897	[1]	$9,814	[1]	$28,061	[1]	$12,258	[1]
[1]	Net revenues are attributed to countries based on location of where revenue is recognized.

LongLived_Assets_by_Geographic

Long-Lived Assets by Geographic Area (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]	'		'
Long-lived assets	$81,312	[1]	$75,743	[1]
United States	'		'
Segment Reporting Information [Line Items]	'		'
Long-lived assets	67,386	[1]	61,439	[1]
MEXICO	'		'
Segment Reporting Information [Line Items]	'		'
Long-lived assets	6,184		6,291
the Netherlands	'		'
Segment Reporting Information [Line Items]	'		'
Long-lived assets	1,297		1,630
Other international	'		'
Segment Reporting Information [Line Items]	'		'
Long-lived assets	$6,445	[1]	$6,383	[1]
[1]	Long-lived assets are attributed to countries based on entity that owns the asset.