Align Technology (ALGN) 10-Q 29 Oct 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 23, 2015
Document Information [Line Items]
Trading Symbol	ALGN
Entity Registrant Name	ALIGN TECHNOLOGY INC
Entity Central Index Key	1,097,149
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		79,490,148

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net revenues	[1]	$ 207,636	$ 189,876	$ 615,210	$ 563,053
Cost of net revenues		50,060	44,822	147,910	135,272
Gross profit		157,576	145,054	467,300	427,781
Operating expenses:
Selling, general and administrative		101,751	80,653	290,657	246,175
Research and development		17,779	12,854	47,348	39,523
Total operating expenses		119,530	93,507	338,005	285,698
Income from operations		38,046	51,547	129,295	142,083
Interest and other income (expenses), net		(1,568)	(1,999)	(2,846)	(1,491)
Net income before provision for income taxes		36,478	49,548	126,449	140,592
Provision for income taxes		8,862	11,301	31,306	34,301
Net income		$ 27,616	$ 38,247	$ 95,143	$ 106,291
Net income per share:
Basic (in usd per share)		$ 0.35	$ 0.47	$ 1.19	$ 1.31
Diluted (in usd per share)		$ 0.34	$ 0.47	$ 1.17	$ 1.29
Shares used in computing net income per share:
Basic (in shares)		79,808	80,629	80,173	80,924
Diluted (in shares)		81,092	82,014	81,576	82,443
[1]	Net revenues are attributed to countries based on location of where revenue is recognized.

CONDENSED CONSOLIDATED STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 27,616	$ 38,247	$ 95,143	$ 106,291
Net change in cumulative translation adjustment	114	(257)	(95)	(155)
Change in unrealized gains (losses) on available-for-sale securities, net of tax	98	(191)	260	(81)
Other comprehensive income (loss)	212	(448)	165	(236)
Comprehensive income	$ 27,828	$ 37,799	$ 95,308	$ 106,055

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 174,040	$ 199,871
Marketable securities, short-term	310,715	254,787
Accounts receivable, net of allowances for doubtful accounts and returns of $1,803 and $1,563, respectively	148,395	129,751
Inventories	18,939	15,928
Prepaid expenses and other current assets	29,554	19,770
Deferred Tax Assets, Net, Current	30,090	37,053
Total current assets	711,733	657,160
Marketable securities, long-term	145,246	147,892
Property, plant and equipment, net	120,738	90,125
Goodwill and intangible assets, net	79,715	82,056
Deferred tax assets	14,542	3,099
Other assets	7,588	7,665
Total assets	1,079,562	987,997
Current liabilities:
Accounts payable	32,599	23,247
Accrued liabilities	95,914	87,880
Deferred revenues	115,998	90,684
Total current liabilities	244,511	201,811
Taxes Payable	34,916	30,483
Other long-term liabilities	1,876	2,932
Total liabilities	$ 281,303	$ 235,226
Commitments and contingencies (Note 6 and 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; 79,564 and 80,205 issued and outstanding, respectively)	8	8
Additional paid-in capital	810,116	783,410
Accumulated other comprehensive income (loss), net	25	(140)
Accumulated deficit	(11,890)	(30,507)
Total stockholders’ equity	798,259	752,771
Total liabilities and stockholders’ equity	$ 1,079,562	$ 987,997

CONDENSED CONSOLIDATED BALANCE5

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts receivable, allowance for doubtful accounts and returns	$ 1,803	$ 1,563
Preferred stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	79,564	80,205
Common stock, shares outstanding	79,564	80,205

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 95,143	$ 106,291
Adjustments to reconcile net profit to net cash provided by operating activities:
Deferred taxes	4,017	20,870
Depreciation and amortization	13,141	13,469
Stock-based compensation	39,135	29,348
Excess tax benefit from share-based payment arrangements	(8,663)	(18,887)
Other non-cash operating activities	9,252	7,368
Changes in assets and liabilities, net of acquired assets and liabilities:
Accounts receivable	(27,123)	(24,930)
Inventories	(3,033)	(2,033)
Prepaid expenses and other assets	(2,529)	(2,349)
Accounts payable	4,408	3,788
Accrued and other long-term liabilities	6,712	12,402
Deferred revenues	28,182	9,957
Net cash provided by operating activities	158,642	155,294
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property, plant and equipment	(36,663)	(16,957)
Purchase of marketable securities	(306,938)	(350,611)
Proceeds from maturities of marketable securities	238,412	124,101
Proceeds from sales of marketable securities	12,518	72,276
Other investing activities	46	(182)
Net cash used in investing activities	(92,625)	(171,373)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	10,559	17,373
Common stock repurchases	(90,603)	(77,417)
Excess tax benefit from share-based payment arrangements	8,663	18,887
Employees’ taxes paid upon the vesting of restricted stock units	(17,574)	(5,761)
Net cash used in financing activities	(88,955)	(46,918)
Effect of foreign exchange rate changes on cash and cash equivalents	(2,893)	720
Net decrease in cash and cash equivalents	(25,831)	(62,277)
Cash and cash equivalents, beginning of the period	199,871	242,953
Cash and cash equivalents, end of the period	$ 174,040	$ 180,676

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
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 nine months ended September 30, 2015 and 2014 , our comprehensive income for the three and nine months ended September 30, 2015 and 2014 , our financial position as of September 30, 2015 and our cash flows for the nine months ended September 30, 2015 and 2014 . The Condensed Consolidated Balance Sheet as of December 31, 2014 was derived from the December 31, 2014 audited financial statements. Net revenues by geographic area for prior period amounts in Note 12 have been reclassified to conform with the current period presentation. These reclassifications had no impact on our financial position for the three and nine months ended September 30, 2015 and 2014 . The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 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, 2014 . 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, revenue recognition, 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. Revenue Recognition In July 2015, we launched a new product policy called "Additional Aligners at No Charge" that addressed one of our customers' top complaints. Previously, we charged customers for additional aligners ordered beyond those covered by the initial treatment plan. With this product policy change, we no longer distinguish between mid-course corrections and case refinements and allow doctors to order additional aligners to address either treatment need at no charge. As part of this change, we also grandfathered over one million open cases under this product policy change. These changes were effective for all new Invisalign Full, Teen, and Assist treatments shipped worldwide after July 18, 2015 as well as any open Invisalign Full, Teen and Assist cases as of that date. We concluded that additional aligners is a separate unit of accounting in our treatment plans, similar to case refinement and mid-course correction. We determined the best estimated selling price (“BESP”) of additional aligners based on a cost and margin analysis, as well as other inputs based on our historical pricing practices. Further, we will continue to allocate revenue to each unit in our treatment plan based on the unit's relative selling price based on BESP and recognize the revenue upon the delivery of each unit in the treatment plan. We regularly review our estimates of selling price and maintain internal controls over the establishment and update of these estimates. Derivative Financial Instruments In September 2015, we entered into foreign currency forward contracts to minimize the short-term impact of foreign currency exchange rate fluctuations on cash and certain trade and intercompany receivables and payables. These forward contracts are not designated as hedging instruments and do not subject us to material balance sheet risk due to fluctuations in foreign currency exchange rates. The gains and losses on these forward contracts are intended to offset the gains and losses in the underlying foreign currency denominated monetary assets and liabilities being economically hedged. We do not enter into foreign currency forward contracts for trading or speculative purposes. These instruments are marked to market through earnings every period and generally are one month in original maturity. The net gain or loss from the settlement of these foreign currency forward contracts is recorded in Interest and other income (expense), net in the consolidated statements of operations. 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. In July 2015, the FASB voted to defer the effective date for annual reporting periods beginning after December, 15, 2017 (including interim reporting periods within those periods) and permitted early adoption of the standard, but not before the original effective date of December 15, 2016. We expect the updated standard to become effective for us in the first quarter of fiscal 2018. 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. In April 2015, the FASB issued ASU No. 2015-05, "Customer's Accounting for Fees Paid in a Cloud Computing Arrangement." providing guidance to entities about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the entity should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the entity should account for the arrangement as a service contract. The new guidance does not change the accounting for an entity's accounting for service contracts. The updated standard becomes effective for interim and annual reporting periods beginning after December 15, 2015. 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	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Marketable Securities and Fair Value Measurements	Note 2. Marketable Securities and Fair Value Measurements As of September 30, 2015 and December 31, 2014 , 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 September 30, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Commercial paper $ 35,938 $ — $ — $ 35,938 Corporate bonds 176,901 45 (84 ) 176,862 Municipal securities 11,694 4 — 11,698 U.S. government agency bonds 58,003 36 — 58,039 U.S. government treasury bonds 27,649 17 — 27,666 U.S. dollar dominated foreign corporate bonds 513 — (1 ) 512 Total Marketable Securities, Short-Term $ 310,698 $ 102 $ (85 ) $ 310,715 Long-term September 30, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency bonds $ 37,733 $ 43 $ — $ 37,776 Corporate bonds 54,808 28 (121 ) 54,715 U.S. dollar dominated foreign corporate bonds — — — — U.S. government treasury bonds 38,741 84 — 38,825 Municipal securities 7,372 17 — 7,389 Asset-backed securities 6,544 — (3 ) 6,541 Total Marketable Securities, Long-Term $ 145,198 $ 172 $ (124 ) $ 145,246 Short-term December 31, 2014 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Commercial paper $ 33,998 $ — $ — $ 33,998 Corporate bonds 152,055 27 (116 ) 151,966 U.S. dollar dominated foreign corporate bonds 901 — — 901 Municipal securities 9,147 13 — 9,160 U.S. government agency bonds 41,574 14 (1 ) 41,587 U.S. government treasury bonds 15,770 7 — 15,777 Certificates of Deposits 1,398 — — 1,398 Total Marketable Securities, Short-Term $ 254,843 $ 61 $ (117 ) $ 254,787 Long-term December 31, 2014 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency bonds $ 48,233 $ 12 $ (28 ) $ 48,217 Corporate bonds 57,195 6 (112 ) 57,089 U.S. dollar dominated foreign corporate bonds 523 — (2 ) 521 U.S. government treasury bonds 20,814 5 (6 ) 20,813 Municipal securities 9,552 5 (6 ) 9,551 Asset-backed securities 11,713 — (12 ) 11,701 Total Marketable Securities, Long-Term $ 148,030 $ 28 $ (166 ) $ 147,892 For the three and nine months ended September 30, 2015 and 2014, realized gains were immaterial. Unrealized gains and losses for our available for sale securities as of September 30, 2015 and December 31, 2014 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 September 30, 2015 and December 31, 2014 . Amounts reclassified to earnings from accumulated other comprehensive income related to unrealized gain or losses were immaterial for the three and nine months ended September 30, 2015 and 2014. Our fixed-income securities investment portfolio consists of corporate bonds, certificates of deposits, 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 and 11 months as of September 30, 2015 and December 31, 2014 , respectively. 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 September 30, 2015 and December 31, 2014 (in thousands): September 30, 2015 December 31, 2014 Due in one year or less $ 310,715 $ 254,787 Due in greater than one year 145,246 147,892 Total available for sale short-term and long-term marketable securities $ 455,961 $ 402,679 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. 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, certificates of deposits, U.S. government agency bonds, asset-backed securities, municipal securities, U.S. dollar dominated foreign corporate bonds and our Israeli funds that are mainly invested in insurance policies and foreign currency forward contracts. 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. The foreign currency forward contracts are valued using observable inputs such as quotations on forward foreign exchange rates. 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. Recurring Fair Value Measurements The following tables summarize our financial assets measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 (in thousands): Description Balance as of September 30, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Cash equivalents: Money market funds $ 71,090 $ 71,090 $ — Commercial paper 48,711 — 48,711 Corporate bonds 400 — 400 Short-term investments: Commercial paper 35,938 — 35,938 Corporate bonds 176,862 — 176,862 Municipal securities 11,698 — 11,698 U.S. government agency bonds 58,039 — 58,039 U.S. government treasury bonds 27,666 27,666 — U.S. dollar dominated foreign corporate bonds 512 — 512 Long-term investments: U.S. government agency bonds 37,776 — 37,776 Corporate bonds 54,715 — 54,715 U.S. dollar dominated foreign corporate bonds — — — U.S. government treasury bonds 38,825 38,825 — Municipal securities 7,389 — 7,389 Asset-backed securities 6,541 — 6,541 Prepaid expenses and other current assets: Israeli funds 2,338 — 2,338 $ 578,500 $ 137,581 $ 440,919 Description Balance as of December 31, 2014 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Cash equivalents: Money market funds $ 80,786 $ 80,786 $ — Commercial paper 21,997 — 21,997 Corporate bonds 1,745 — 1,745 Short-term investments: Commercial paper 33,998 — 33,998 Corporate bonds 151,966 — 151,966 U.S. dollar denominated foreign corporate bonds 901 — 901 Municipal securities 9,160 — 9,160 U.S. government agency bonds 41,587 — 41,587 U.S. government treasury bonds 15,777 15,777 — Certificates of Deposits 1,398 — 1,398 Long-term investments: U.S. government agency bonds 48,217 — 48,217 Corporate bonds 57,089 — 57,089 U.S. dollar denominated foreign corporate bonds 521 — 521 U.S. government treasury bonds 20,813 20,813 — Municipal securities 9,551 — 9,551 Asset-backed securities 11,701 — 11,701 Prepaid expenses and other current assets: Israeli funds 2,307 — 2,307 $ 509,514 $ 117,376 $ 392,138 Derivative Financial Instruments In September 2015, we began entering into foreign currency forward contracts to minimize the short-term impact of foreign currency exchange rate fluctuations on cash and certain trade and intercompany receivables and payables. These instruments are classified within level 2 of the fair value hierarchy and are included in prepaid expenses and other current assets. The net loss on these forward contracts was immaterial for the three and nine months ended September 30, 2015. As of September 30, 2015, the fair value of foreign exchange forward contracts outstanding was a loss of $0.1 million . The following table presents the gross notional value of all our foreign exchange forward contracts outstanding as of September 30, 2015 (in thousands): As of September 30, 2015 Local Currency Amount Notional Contract Amount (USD) US dollar $ 31,600 $ 31,600 Euro €14,600 16,428 Japanese yen ¥1,680,000 14,018 Australian dollar A$5,200 3,657 Hong Kong dollar HK$ 27,000 3,494 Singapore dollar S$2,600 1,817 $ 71,014

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Balance Sheet Components	Balance Sheet Components Inventories Inventories consist of the following (in thousands): September 30, December 31, Raw materials $ 9,690 $ 8,143 Work in process 6,659 2,970 Finished goods 2,590 4,815 Total Inventories $ 18,939 $ 15,928 Work in process includes costs to produce our clear aligner and intra-oral products. The increase in work in process from December 30, 2014 to September 30, 2015 is due to the production ramp up of iTero Element scanners, which began shipping late in the third quarter of 2015. 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): September 30, December 31, Accrued payroll and benefits $ 48,150 $ 44,610 Accrued sales rebates 7,172 11,110 Accrued sales and marketing expenses 6,006 5,979 Accrued accounts payable 8,582 5,736 Accrued sales tax and value added tax 5,650 5,456 Accrued professional fees 3,841 2,494 Accrued warranty 2,711 3,148 Accrued income taxes 2,400 2,027 Other accrued liabilities 11,402 7,320 Total Accrued Liabilities $ 95,914 $ 87,880 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 September 30, 2015 and 2014 consists of the following activity (in thousands): Nine Months Ended 2015 2014 Balance at beginning of period $ 3,148 $ 3,104 Charged to cost of net revenues 1,308 1,529 Actual warranty expenditures (1,745 ) (1,370 ) Balance at end of period $ 2,711 $ 3,263

Goodwill and Long-lived Assets

Goodwill and Long-lived Assets	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Goodwill and Long-lived Assets	Goodwill and Long-lived Assets Goodwill On April 29, 2011, we acquired Cadent Holdings, Inc. (“Cadent”). In connection with the acquisition, we allocated approximately $58.0 million of goodwill to our Clear Aligner reporting unit based on the expected relative synergies generated by the acquisition. On April 30, 2013, we acquired ICA Holdings Pty Limited in a purchase business combination of which $3.6 million was recorded to goodwill, which was attributed to our Clear Aligner reporting unit. The change in the carrying value of goodwill for the nine months ended September 30, 2015 , all attributable to our Clear Aligner reporting unit, is as follows (in thousands): Clear Aligner Balance as of December 31, 2014 $ 61,369 Adjustments 1 (391 ) Balance as of September 30, 2015 $ 60,978 1 The adjustments to goodwill during the nine months ended September 30, 2015 were due to foreign currency translation. During the fourth quarter of fiscal 2014, 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. Acquired intangible assets, arising either as a direct result from the Cadent acquisition or individually acquired, are being amortized as follows (in thousands): Weighted Average Amortization Period (in years) Gross Carrying Amount as of September 30, 2015 Accumulated Amortization Accumulated Impairment Loss Net Carrying Trademarks 15 $ 7,100 $ (1,457 ) $ (4,179 ) $ 1,464 Existing technology 13 12,600 (3,437 ) (4,328 ) 4,835 Customer relationships 11 33,500 (10,492 ) (10,751 ) 12,257 Other 8 285 (104 ) — 181 Total Intangible Assets $ 53,485 $ (15,490 ) $ (19,258 ) $ 18,737 Weighted Average Amortization Period (in years) Gross Carrying Amount as of December 31, 2014 Accumulated Amortization Accumulated Impairment Loss Net Carrying Value as of December 31, 2014 Trademarks 15 $ 7,100 $ (1,354 ) $ (4,179 ) $ 1,567 Existing technology 13 12,600 (3,015 ) (4,328 ) 5,257 Customer relationships 11 33,500 (9,095 ) (10,751 ) 13,654 Other 8 285 (76 ) — 209 Total Intangible Assets $ 53,485 $ (13,540 ) $ (19,258 ) $ 20,687 The total estimated annual future amortization expense for these acquired intangible assets as of September 30, 2015 is as follows (in thousands): Fiscal Year Ending December 31, Remainder of 2015 $ 650 2016 2,600 2017 2,600 2018 2,600 2019 2,592 Thereafter 7,695 Total $ 18,737

Credit Facilities

Credit Facilities	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Credit Facilities	Credit Facilities On March 22, 2013, we entered into a credit facility, which 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 September 30, 2015 , we had no outstanding borrowings under this credit facility; however, we were not in compliance with certain negative covenants. As a result, on October 15, 2015, we received a waiver for our non-compliance and also amended the credit facility in regards to these negative covenants.

Legal Proceedings (Notes)

Legal Proceedings (Notes)	9 Months Ended
	Sep. 30, 2015
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 former 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 attorneys’ fees. On December 9, 2013, the court granted defendants’ 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 amended complaint. On August 22, 2014, the court granted our motion to dismiss without leave to amend. On September 22, 2014, Plaintiff filed a notice of appeal to the Ninth Circuit Court of Appeals. 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 attorneys’ 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. On October 14, 2014, an Order was entered staying this derivative lawsuit until a ruling by the Ninth Circuit in the Securities Action discussed above. 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	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases As of September 30, 2015 , minimum future lease payments for non-cancelable operating leases are as follows (in thousands): Fiscal Year Ending December 31, Operating leases Remainder of 2015 $ 2,594 2016 9,982 2017 5,952 2018 2,409 2019 529 Thereafter 438 Total minimum future lease payments $ 21,904 Off-balance Sheet Arrangements As of September 30, 2015 , 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 September 30, 2015 , we did not have any material indemnification claims that were probable or reasonably possible.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Stock-based Compensation	Stock-based Compensation Summary of stock-based compensation expense As of September 30, 2015 , the 2005 Incentive Plan (as amended) has a total reserve of 23,283,379 shares of which 5,371,675 shares are available for issuance. 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 nine months ended September 30, 2015 and 2014 is as follows (in thousands): Three Months Ended Nine Months Ended 2015 2014 2015 2014 Cost of net revenues $ 984 $ 867 $ 2,929 $ 2,648 Selling, general and administrative 11,564 7,381 30,106 21,748 Research and development 2,113 1,662 6,100 4,952 Total stock-based compensation $ 14,661 $ 9,910 $ 39,135 $ 29,348 Options Activity for the nine months ended September 30, 2015 under the stock option plans is set forth below (in thousands, except years and per share amounts): Stock Options Number of Shares Underlying Stock Options Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (in years ) Outstanding as of December 31, 2014 668 $ 15.57 Granted — — Exercised (129 ) 16.47 Cancelled or expired — — Outstanding as of September 30, 2015 539 $ 15.36 2.28 $ 22,300 Vested and expected to vest at September 30, 2015 539 $ 15.36 2.28 $ 22,300 Exercisable at September 30, 2015 539 $ 15.36 2.28 $ 22,300 There were no stock options granted during the nine months ended September 30, 2015 and 2014 . All compensation costs relating to stock options have been recognized as of September 30, 2015. Restricted Stock Units (“RSU”) A summary of the RSU activity for the nine months ended September 30, 2015 is as follows (in thousands, except years): Number of Shares Underlying RSU Weighted Average Grant Date Fair Value Weighted Remaining Contractual Period Aggregate Intrinsic Value (in years) Nonvested as of December 31, 2014 2,124 $ 42.08 Granted 835 57.72 Vested and released (661 ) 36.77 Forfeited (80 ) 47.48 Nonvested as of September 30, 2015 2,218 $ 49.39 1.34 $ 125,883 As of September 30, 2015 , the total unamortized compensation cost related to RSU, net of estimated forfeitures, was $75.0 million , which we expect to recognize over a weighted average period of 2.3 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 nine months ended September 30, 2015 (in thousands, except years): Number of Shares Underlying MSU Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Period Aggregate Intrinsic Value (in years ) Nonvested as of December 31, 2014 498 $ 42.00 Granted 289 61.73 Vested and released (162 ) 30.28 Forfeited (14 ) 53.69 Nonvested as of September 30, 2015 611 $ 51.41 1.55 $ 34,689 As of September 30, 2015 , the total unamortized compensation costs related to the MSU, net of estimated forfeitures, was $16.2 million , which we expect to recognize over a weighted average period of 1.6 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 September 30, 2015 , there remains 1,133,749 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: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Expected term (in years) 1.2 1.3 1.2 1.2 Expected volatility 27.9 % 35.8 % 31.1 % 38.8 % Risk-free interest rate 0.41 % 0.24 % 0.29 % 0.20 % Expected dividends — — — — Weighted average fair value at grant date $ 17.10 $ 16.44 $ 16.19 $ 17.15 As of September 30, 2015 , the total unamortized compensation cost related to employee purchases was $2.8 million , which we expect to recognize over a weighted average period of 0.8 year.

Common Stock Repurchase Program

Common Stock Repurchase Program	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Common Stock Repurchase	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 authorized over the first 12 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, on April 28, 2014, we entered into an accelerated share repurchase agreement ("2014 ASR") to repurchase $70.0 million of our common stock which was completed in July 2014. We received a total of approximately 1.4 million shares under the 2014 ASR for an average purchase price per share of $51.46 , which all shares were retired. The final number of shares repurchased was based on our volume-weighted average stock price during the term of the transaction, less an agreed upon discount. During 2014, we repurchased on the open market approximately 0.6 million shares of our common stock at an average price of $50.93 per share, including commissions, for an aggregate purchase price of approximately $28.2 million . In the first quarter of 2015, we repurchased on the open market approximately 0.03 million shares of our common stock at an average price of $57.49 per share, including commission for an aggregate purchase price of approximately $1.8 million . All repurchased shares were retired. In January 2015, our Board of Directors authorized the repurchase of the next $100.0 million under the repurchase program which we anticipate completing within twelve months. On April 28, 2015, we entered into an accelerated share purchase agreement ("2015 ASR") to repurchase $70.0 million of our common stock. Under the terms of the 2015 ASR, we paid $70.0 million on April 29, 2015 and received an initial delivery of approximately 0.8 million shares. The 2015 ASR was completed on July 23, 2015 with a final delivery of approximately 0.3 million shares. We received a total of approximately 1.2 million shares under the 2015 ASR for an average share price of $60.52 , which all shares were retired. The final number of shares repurchased was based on our volume-weighted average stock price during the term of the transaction, less an agreed upon discount. During the three months ended September 30, 2015, we repurchased on the open market approximately 0.3 million shares of our common stock at an average price of $57.04 per share, including commissions, for an aggregate purchase price of approximately $18.8 million . All repurchased shares were retired. As of September 30, 2015, we have $111.2 million remaining under the April 2014 stock repurchase program, $11.2 million of which we expect to purchase within the next six months.

Accounting for Income Taxes

Accounting for Income Taxes	9 Months Ended
	Sep. 30, 2015
Accounting for Income Taxes	Accounting for Income Taxes Our provision for income taxes was $ 8.9 million and $ 11.3 million for the three months ended September 30, 2015 and 2014 , respectively. This represents effective tax rates of 24.3% and 22.8% , respectively. Our effective tax rates differ from the statutory federal income tax rate of 35% due to certain foreign earnings, primarily from Costa Rica, which are subject to a lower tax rate, state income tax expense, the tax impact of certain stock-based compensation charges and unrecognized tax benefits. The increase in the effective rate for the three months ended September 30, 2015 compared to the three months ended September 30, 2014 reflects a jurisdictional shift in forecasted earnings from lower tax non-U.S. jurisdictions to the U.S. Our provision for income taxes was $31.3 million and $ 34.3 million for the nine months ended September 30, 2015 and 2014 , respectively. This represents effective tax rates of 24.8% and 24.4% , respectively. The increase in the effective rate for the nine months ended September 30, 2015 compared to the nine months ended September 30, 2014 reflects a jurisdictional shift in forecasted earnings from lower tax non-U.S. jurisdictions to the U.S., offset by a negative impact in prior year from a $1.8 million adjustment which related to prior periods. 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 September 30, 2015 , we maintained a valuation allowance of $32.8 million against deferred tax assets primarily related to Israel and California operating loss carryforwards and Australia 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. Our total gross unrecognized tax benefits was $37.8 million and $33.1 million as of September 30, 2015 and December 31, 2014 , respectively, 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 and nine months ended September 30, 2015 was not material. We do not expect any significant changes to the amount of unrecognized tax benefit within the next twelve months. We file U.S. federal, U.S. state, and non-U.S. income tax returns. Our major tax jurisdictions are U.S. federal and the State of California. For U.S. federal and state tax returns, we are no longer subject to tax examinations for years before 2000. With few exceptions, we are no longer subject to examination by foreign tax authorities for years before 2007. We are currently under audit by the California Franchise Tax Board for fiscal year 2011, 2012 and 2013. 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 2015 and 2014. Income taxes were reduced by $8.2 million and $7.7 million for the three months ended September 30, 2015 and 2014 , respectively, representing a benefit to diluted net income per share of $0.10 and $0.09 in 2015 and 2014 , respectively. As a result of these incentives, our income taxes were reduced by $24.6 million and $22.8 million for the nine months ended September 30, 2015 and 2014 , respectively, representing a benefit to diluted net income per share of $0.30 and $0.28 in 2015 and 2014 , respectively.

Net Profit Per Share

Net Profit Per Share	9 Months Ended
	Sep. 30, 2015
Net Profit Per Share	Net Income Per Share Basic net income per share is computed using the weighted average number of shares of common stock outstanding during the period. Diluted net income 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 RSU, MSU, stock options and ESPP. The following table sets forth the computation of basic and diluted net income per share attributable to common stock (in thousands, except per share amounts): Three Months Ended, September 30, Nine Months Ended, September 30, 2015 2014 2015 2014 Numerator: Net income $ 27,616 $ 38,247 $ 95,143 $ 106,291 Denominator: Weighted-average common shares outstanding, basic 79,808 80,629 80,173 80,924 Dilutive effect of potential common stock 1,284 1,385 1,403 1,519 Total shares, diluted 81,092 82,014 81,576 82,443 Net income per share, basic $ 0.35 $ 0.47 $ 1.19 $ 1.31 Net income per share, diluted $ 0.34 $ 0.47 $ 1.17 $ 1.29 For the three and nine months ended September 30, 2015 and 2014, the anti-dilutive effect from RSU, MSU and ESPP was not material.

Segments and Geographical Infor

Segments and Geographical Information	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
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 and Services 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 and Services ("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 September 30, For the Nine Months Ended September 30, Net Revenues 2015 2014 2015 2014 Clear Aligner $ 198,292 $ 178,138 $ 586,138 $ 526,112 Scanner 9,344 11,738 29,072 36,941 Total net revenues $ 207,636 $ 189,876 $ 615,210 $ 563,053 Gross profit Clear Aligner $ 156,205 $ 141,117 $ 461,502 $ 415,903 Scanner 1,371 3,937 5,798 11,878 Total gross profit $ 157,576 $ 145,054 $ 467,300 $ 427,781 Geographical Information Net revenues are presented below by geographic area (in thousands): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Net revenues: (1) U.S. $ 143,933 $ 134,244 $ 429,005 $ 396,837 the Netherlands 37,427 34,538 118,295 113,828 Other international 26,276 21,094 67,910 52,388 Total net revenues $ 207,636 $ 189,876 $ 615,210 $ 563,053 (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): September 30, 2015 December 31, 2014 Long-lived assets: (2) United States $ 97,789 $ 76,511 Mexico 14,655 6,229 Other International 8,294 7,385 Total long-lived assets $ 120,738 $ 90,125 (2) Long-lived assets are attributed to countries based on entity that owns the asset .

Summary of Significant Accoun19

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
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 nine months ended September 30, 2015 and 2014 , our comprehensive income for the three and nine months ended September 30, 2015 and 2014 , our financial position as of September 30, 2015 and our cash flows for the nine months ended September 30, 2015 and 2014 . The Condensed Consolidated Balance Sheet as of December 31, 2014 was derived from the December 31, 2014 audited financial statements. Net revenues by geographic area for prior period amounts in Note 12 have been reclassified to conform with the current period presentation. These reclassifications had no impact on our financial position for the three and nine months ended September 30, 2015 and 2014 . The results of operations for the three and nine months ended September 30, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 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, 2014 .
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, revenue recognition, 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. In July 2015, the FASB voted to defer the effective date for annual reporting periods beginning after December, 15, 2017 (including interim reporting periods within those periods) and permitted early adoption of the standard, but not before the original effective date of December 15, 2016. We expect the updated standard to become effective for us in the first quarter of fiscal 2018. 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. In April 2015, the FASB issued ASU No. 2015-05, "Customer's Accounting for Fees Paid in a Cloud Computing Arrangement." providing guidance to entities about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the entity should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the entity should account for the arrangement as a service contract. The new guidance does not change the accounting for an entity's accounting for service contracts. The updated standard becomes effective for interim and annual reporting periods beginning after December 15, 2015. We are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures.

Marketable Securities and Fai20

Marketable Securities and Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Short-Term And Long-Term Marketable Securities	As of September 30, 2015 and December 31, 2014 , 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 September 30, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Commercial paper $ 35,938 $ — $ — $ 35,938 Corporate bonds 176,901 45 (84 ) 176,862 Municipal securities 11,694 4 — 11,698 U.S. government agency bonds 58,003 36 — 58,039 U.S. government treasury bonds 27,649 17 — 27,666 U.S. dollar dominated foreign corporate bonds 513 — (1 ) 512 Total Marketable Securities, Short-Term $ 310,698 $ 102 $ (85 ) $ 310,715 Long-term September 30, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency bonds $ 37,733 $ 43 $ — $ 37,776 Corporate bonds 54,808 28 (121 ) 54,715 U.S. dollar dominated foreign corporate bonds — — — — U.S. government treasury bonds 38,741 84 — 38,825 Municipal securities 7,372 17 — 7,389 Asset-backed securities 6,544 — (3 ) 6,541 Total Marketable Securities, Long-Term $ 145,198 $ 172 $ (124 ) $ 145,246 Short-term December 31, 2014 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Commercial paper $ 33,998 $ — $ — $ 33,998 Corporate bonds 152,055 27 (116 ) 151,966 U.S. dollar dominated foreign corporate bonds 901 — — 901 Municipal securities 9,147 13 — 9,160 U.S. government agency bonds 41,574 14 (1 ) 41,587 U.S. government treasury bonds 15,770 7 — 15,777 Certificates of Deposits 1,398 — — 1,398 Total Marketable Securities, Short-Term $ 254,843 $ 61 $ (117 ) $ 254,787 Long-term December 31, 2014 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. government agency bonds $ 48,233 $ 12 $ (28 ) $ 48,217 Corporate bonds 57,195 6 (112 ) 57,089 U.S. dollar dominated foreign corporate bonds 523 — (2 ) 521 U.S. government treasury bonds 20,814 5 (6 ) 20,813 Municipal securities 9,552 5 (6 ) 9,551 Asset-backed securities 11,713 — (12 ) 11,701 Total Marketable Securities, Long-Term $ 148,030 $ 28 $ (166 ) $ 147,892
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 September 30, 2015 and December 31, 2014 (in thousands): September 30, 2015 December 31, 2014 Due in one year or less $ 310,715 $ 254,787 Due in greater than one year 145,246 147,892 Total available for sale short-term and long-term marketable securities $ 455,961 $ 402,679
Financial Assets Measured At Fair Value On Recurring Basis	The following tables summarize our financial assets measured at fair value on a recurring basis as of September 30, 2015 and December 31, 2014 (in thousands): Description Balance as of September 30, 2015 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Cash equivalents: Money market funds $ 71,090 $ 71,090 $ — Commercial paper 48,711 — 48,711 Corporate bonds 400 — 400 Short-term investments: Commercial paper 35,938 — 35,938 Corporate bonds 176,862 — 176,862 Municipal securities 11,698 — 11,698 U.S. government agency bonds 58,039 — 58,039 U.S. government treasury bonds 27,666 27,666 — U.S. dollar dominated foreign corporate bonds 512 — 512 Long-term investments: U.S. government agency bonds 37,776 — 37,776 Corporate bonds 54,715 — 54,715 U.S. dollar dominated foreign corporate bonds — — — U.S. government treasury bonds 38,825 38,825 — Municipal securities 7,389 — 7,389 Asset-backed securities 6,541 — 6,541 Prepaid expenses and other current assets: Israeli funds 2,338 — 2,338 $ 578,500 $ 137,581 $ 440,919 Description Balance as of December 31, 2014 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Cash equivalents: Money market funds $ 80,786 $ 80,786 $ — Commercial paper 21,997 — 21,997 Corporate bonds 1,745 — 1,745 Short-term investments: Commercial paper 33,998 — 33,998 Corporate bonds 151,966 — 151,966 U.S. dollar denominated foreign corporate bonds 901 — 901 Municipal securities 9,160 — 9,160 U.S. government agency bonds 41,587 — 41,587 U.S. government treasury bonds 15,777 15,777 — Certificates of Deposits 1,398 — 1,398 Long-term investments: U.S. government agency bonds 48,217 — 48,217 Corporate bonds 57,089 — 57,089 U.S. dollar denominated foreign corporate bonds 521 — 521 U.S. government treasury bonds 20,813 20,813 — Municipal securities 9,551 — 9,551 Asset-backed securities 11,701 — 11,701 Prepaid expenses and other current assets: Israeli funds 2,307 — 2,307 $ 509,514 $ 117,376 $ 392,138
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table presents the gross notional value of all our foreign exchange forward contracts outstanding as of September 30, 2015 (in thousands): As of September 30, 2015 Local Currency Amount Notional Contract Amount (USD) US dollar $ 31,600 $ 31,600 Euro €14,600 16,428 Japanese yen ¥1,680,000 14,018 Australian dollar A$5,200 3,657 Hong Kong dollar HK$ 27,000 3,494 Singapore dollar S$2,600 1,817 $ 71,014

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Schedule of Inventories	Inventories consist of the following (in thousands): September 30, December 31, Raw materials $ 9,690 $ 8,143 Work in process 6,659 2,970 Finished goods 2,590 4,815 Total Inventories $ 18,939 $ 15,928
Schedule of Accrued Liabilities	Accrued liabilities consist of the following (in thousands): September 30, December 31, Accrued payroll and benefits $ 48,150 $ 44,610 Accrued sales rebates 7,172 11,110 Accrued sales and marketing expenses 6,006 5,979 Accrued accounts payable 8,582 5,736 Accrued sales tax and value added tax 5,650 5,456 Accrued professional fees 3,841 2,494 Accrued warranty 2,711 3,148 Accrued income taxes 2,400 2,027 Other accrued liabilities 11,402 7,320 Total Accrued Liabilities $ 95,914 $ 87,880
Warranty Accrual	Warranty accrual as of September 30, 2015 and 2014 consists of the following activity (in thousands): Nine Months Ended 2015 2014 Balance at beginning of period $ 3,148 $ 3,104 Charged to cost of net revenues 1,308 1,529 Actual warranty expenditures (1,745 ) (1,370 ) Balance at end of period $ 2,711 $ 3,263

Goodwill and Long-lived Assets

Goodwill and Long-lived Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Summary of Goodwill by Reportable Segment	The change in the carrying value of goodwill for the nine months ended September 30, 2015 , all attributable to our Clear Aligner reporting unit, is as follows (in thousands): Clear Aligner Balance as of December 31, 2014 $ 61,369 Adjustments 1 (391 ) Balance as of September 30, 2015 $ 60,978
Schedule Of Amortized Intangible Assets	Acquired intangible assets, arising either as a direct result from the Cadent acquisition or individually acquired, are being amortized as follows (in thousands): Weighted Average Amortization Period (in years) Gross Carrying Amount as of September 30, 2015 Accumulated Amortization Accumulated Impairment Loss Net Carrying Trademarks 15 $ 7,100 $ (1,457 ) $ (4,179 ) $ 1,464 Existing technology 13 12,600 (3,437 ) (4,328 ) 4,835 Customer relationships 11 33,500 (10,492 ) (10,751 ) 12,257 Other 8 285 (104 ) — 181 Total Intangible Assets $ 53,485 $ (15,490 ) $ (19,258 ) $ 18,737 Weighted Average Amortization Period (in years) Gross Carrying Amount as of December 31, 2014 Accumulated Amortization Accumulated Impairment Loss Net Carrying Value as of December 31, 2014 Trademarks 15 $ 7,100 $ (1,354 ) $ (4,179 ) $ 1,567 Existing technology 13 12,600 (3,015 ) (4,328 ) 5,257 Customer relationships 11 33,500 (9,095 ) (10,751 ) 13,654 Other 8 285 (76 ) — 209 Total Intangible Assets $ 53,485 $ (13,540 ) $ (19,258 ) $ 20,687
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The total estimated annual future amortization expense for these acquired intangible assets as of September 30, 2015 is as follows (in thousands): Fiscal Year Ending December 31, Remainder of 2015 $ 650 2016 2,600 2017 2,600 2018 2,600 2019 2,592 Thereafter 7,695 Total $ 18,737

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
Schedule of Future Lease Payments	As of September 30, 2015 , minimum future lease payments for non-cancelable operating leases are as follows (in thousands): Fiscal Year Ending December 31, Operating leases Remainder of 2015 $ 2,594 2016 9,982 2017 5,952 2018 2,409 2019 529 Thereafter 438 Total minimum future lease payments $ 21,904

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2015
Stock-based Compensation Expense	The stock-based compensation related to all of our stock-based awards and employee stock purchases for the three and nine months ended September 30, 2015 and 2014 is as follows (in thousands): Three Months Ended Nine Months Ended 2015 2014 2015 2014 Cost of net revenues $ 984 $ 867 $ 2,929 $ 2,648 Selling, general and administrative 11,564 7,381 30,106 21,748 Research and development 2,113 1,662 6,100 4,952 Total stock-based compensation $ 14,661 $ 9,910 $ 39,135 $ 29,348
Stock Option Activity	Activity for the nine months ended September 30, 2015 under the stock option plans is set forth below (in thousands, except years and per share amounts): Stock Options Number of Shares Underlying Stock Options Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term Aggregate Intrinsic Value (in years ) Outstanding as of December 31, 2014 668 $ 15.57 Granted — — Exercised (129 ) 16.47 Cancelled or expired — — Outstanding as of September 30, 2015 539 $ 15.36 2.28 $ 22,300 Vested and expected to vest at September 30, 2015 539 $ 15.36 2.28 $ 22,300 Exercisable at September 30, 2015 539 $ 15.36 2.28 $ 22,300	[1]
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: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Expected term (in years) 1.2 1.3 1.2 1.2 Expected volatility 27.9 % 35.8 % 31.1 % 38.8 % Risk-free interest rate 0.41 % 0.24 % 0.29 % 0.20 % Expected dividends — — — — Weighted average fair value at grant date $ 17.10 $ 16.44 $ 16.19 $ 17.15
Restricted Stock Units (RSUs)
Summary Of Nonvested Shares	A summary of the RSU activity for the nine months ended September 30, 2015 is as follows (in thousands, except years): Number of Shares Underlying RSU Weighted Average Grant Date Fair Value Weighted Remaining Contractual Period Aggregate Intrinsic Value (in years) Nonvested as of December 31, 2014 2,124 $ 42.08 Granted 835 57.72 Vested and released (661 ) 36.77 Forfeited (80 ) 47.48 Nonvested as of September 30, 2015 2,218 $ 49.39 1.34 $ 125,883
Market Performance Based Restricted Stock Units
Summary Of Nonvested Shares	The following table summarizes the MSU activity for the nine months ended September 30, 2015 (in thousands, except years): Number of Shares Underlying MSU Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Period Aggregate Intrinsic Value (in years ) Nonvested as of December 31, 2014 498 $ 42.00 Granted 289 61.73 Vested and released (162 ) 30.28 Forfeited (14 ) 53.69 Nonvested as of September 30, 2015 611 $ 51.41 1.55 $ 34,689
[1]	There were no stock options granted during the nine months ended September 30, 2015 and 2014. All compensation costs relating to stock options have been recognized as of September 30, 2015.

Net Profit Per Share (Tables)

Net Profit Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Schedule Of Earnings Per Share Basic And Diluted	The following table sets forth the computation of basic and diluted net income per share attributable to common stock (in thousands, except per share amounts): Three Months Ended, September 30, Nine Months Ended, September 30, 2015 2014 2015 2014 Numerator: Net income $ 27,616 $ 38,247 $ 95,143 $ 106,291 Denominator: Weighted-average common shares outstanding, basic 79,808 80,629 80,173 80,924 Dilutive effect of potential common stock 1,284 1,385 1,403 1,519 Total shares, diluted 81,092 82,014 81,576 82,443 Net income per share, basic $ 0.35 $ 0.47 $ 1.19 $ 1.31 Net income per share, diluted $ 0.34 $ 0.47 $ 1.17 $ 1.29

Segments and Geographical Inf26

Segments and Geographical Information (Tables)	9 Months Ended
	Sep. 30, 2015
Notes To Financial Statements [Abstract]
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 September 30, For the Nine Months Ended September 30, Net Revenues 2015 2014 2015 2014 Clear Aligner $ 198,292 $ 178,138 $ 586,138 $ 526,112 Scanner 9,344 11,738 29,072 36,941 Total net revenues $ 207,636 $ 189,876 $ 615,210 $ 563,053 Gross profit Clear Aligner $ 156,205 $ 141,117 $ 461,502 $ 415,903 Scanner 1,371 3,937 5,798 11,878 Total gross profit $ 157,576 $ 145,054 $ 467,300 $ 427,781 Geographical Information Net revenues are presented below by geographic area (in thousands): For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014 Net revenues: (1) U.S. $ 143,933 $ 134,244 $ 429,005 $ 396,837 the Netherlands 37,427 34,538 118,295 113,828 Other international 26,276 21,094 67,910 52,388 Total net revenues $ 207,636 $ 189,876 $ 615,210 $ 563,053 (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): September 30, 2015 December 31, 2014 Long-lived assets: (2) United States $ 97,789 $ 76,511 Mexico 14,655 6,229 Other International 8,294 7,385 Total long-lived assets $ 120,738 $ 90,125 (2) Long-lived assets are attributed to countries based on entity that owns the asset .

Short-Term and Long-Term Market

Short-Term and Long-Term Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Total available for sale short-term and long-term marketable securities	$ 455,961	$ 402,679
Fair Value, Measurements, Recurring [Member] | Short-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	310,698	254,843
Gross Unrealized Gains	102	61
Gross Unrealized Losses	(85)	(117)
Total available for sale short-term and long-term marketable securities	310,715	254,787
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,938	33,998
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total available for sale short-term and long-term marketable securities	35,938	33,998
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	176,901	152,055
Gross Unrealized Gains	45	27
Gross Unrealized Losses	(84)	(116)
Total available for sale short-term and long-term marketable securities	176,862	151,966
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. government agency bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	58,003	41,574
Gross Unrealized Gains	36	14
Gross Unrealized Losses	0	(1)
Total available for sale short-term and long-term marketable securities	58,039	41,587
Fair Value, Measurements, Recurring [Member] | Short-term Investments | US Treasury Bond Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		15,770
Gross Unrealized Gains		7
Gross Unrealized Losses		0
Total available for sale short-term and long-term marketable securities		15,777
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,398
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total available for sale short-term and long-term marketable securities		1,398
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,694	9,147
Gross Unrealized Gains	4	13
Gross Unrealized Losses	0	0
Total available for sale short-term and long-term marketable securities	11,698	9,160
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	513	901
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	0
Total available for sale short-term and long-term marketable securities	512	901
Fair Value, Measurements, Recurring [Member] | Short-term Investments | U.S. government treasury bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	27,649
Gross Unrealized Gains	17
Gross Unrealized Losses	0
Total available for sale short-term and long-term marketable securities	27,666	15,777
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Total available for sale short-term and long-term marketable securities		1,398
Fair Value, Measurements, Recurring [Member] | Long-term Investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	145,198	148,030
Gross Unrealized Gains	172	28
Gross Unrealized Losses	(124)	(166)
Total available for sale short-term and long-term marketable securities	145,246	147,892
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,808	57,195
Gross Unrealized Gains	28	6
Gross Unrealized Losses	(121)	(112)
Total available for sale short-term and long-term marketable securities	54,715	57,089
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Foreign Government Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Total available for sale short-term and long-term marketable securities	0	521
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. government agency bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	37,733	48,233
Gross Unrealized Gains	43	12
Gross Unrealized Losses	0	(28)
Total available for sale short-term and long-term marketable securities	37,776	48,217
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,544	11,713
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	(12)
Total available for sale short-term and long-term marketable securities	6,541	11,701
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,372	9,552
Gross Unrealized Gains	17	5
Gross Unrealized Losses	0	(6)
Total available for sale short-term and long-term marketable securities	7,389	9,551
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		523
Gross Unrealized Gains		0
Gross Unrealized Losses		(2)
Total available for sale short-term and long-term marketable securities	0	521
Fair Value, Measurements, Recurring [Member] | Long-term Investments | U.S. government treasury bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,741	20,814
Gross Unrealized Gains	84	5
Gross Unrealized Losses	0	(6)
Total available for sale short-term and long-term marketable securities	$ 38,825	$ 20,813

Marketable Securities and Fai28

Marketable Securities and Fair Value Measurements Additional Information (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Maturity Period Used To Classify Investments	10 months	11 months
Maximum
Schedule of Available-for-sale Securities [Line Items]
Maturity Period Used To Classify Investments	27 months

Marketable Securities and Fai29

Marketable Securities and Fair Value Measurements Available For Sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Due in one year or less	$ 310,715	$ 254,787
Due in greater than one year	145,246	147,892
Total available for sale short-term and long-term marketable securities	$ 455,961	$ 402,679

Summary of Financial Assets Mea

Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	$ 455,961,000	$ 402,679,000
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	578,500,000	509,514,000
Fair Value, Measurements, Recurring [Member] | Israeli Severance Funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Other assets	2,338,000	2,307,000
Fair Value, Measurements, Recurring [Member] | Cash Equivalents | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	400,000
Fair Value, Measurements, Recurring [Member] | Cash Equivalents | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	71,090,000	80,786,000
Fair Value, Measurements, Recurring [Member] | Cash Equivalents | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	48,711,000	21,997,000
Fair Value, Measurements, Recurring [Member] | Cash Equivalents | U.S. dollar dominated foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		1,745,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	310,715,000	254,787,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	35,938,000	33,998,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	176,862,000	151,966,000
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	512,000	901,000
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	58,039,000	41,587,000
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	27,666,000	15,777,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments		1,398,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	11,698,000	9,160,000
Fair Value, Measurements, Recurring [Member] | Short-term Investments | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments		1,398,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	145,246,000	147,892,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	54,715,000	57,089,000
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	0	521,000
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	37,776,000	48,217,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Foreign bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	0	521,000
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	38,825,000	20,813,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	7,389,000	9,551,000
Fair Value, Measurements, Recurring [Member] | Long-term Investments | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	6,541,000	11,701,000
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	137,581,000	117,376,000
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 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	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	71,090,000	80,786,000
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) | Cash Equivalents | U.S. dollar dominated foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		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	0
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-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) | Short-term Investments | U.S. government treasury bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	27,666,000	15,777,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term Investments | Certificates of deposit
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 | 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 | 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. 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) | 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	38,825,000	20,813,000
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 | 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	440,919,000	392,138,000
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	2,338,000	2,307,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Cash Equivalents | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	400,000
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	48,711,000	21,997,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Cash Equivalents | U.S. dollar dominated foreign corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		1,745,000
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	35,938,000	33,998,000
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	176,862,000	151,966,000
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	512,000	901,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | U.S. government agency bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments	58,039,000	41,587,000
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	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Short-term Investments | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments		1,398,000
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	11,698,000	9,160,000
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	54,715,000	57,089,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) | Long-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] | 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	37,776,000	48,217,000
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		521,000
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	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	7,389,000	9,551,000
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	$ 6,541,000	$ 11,701,000

Marketable Securities and Fai31

Marketable Securities and Fair Value Measurements - Derivative Notional Instruments (Details) - 9 months ended Sep. 30, 2015 - Foreign Exchange Forward € in Thousands, ¥ in Thousands, SGD in Thousands, HKD in Thousands, AUD in Thousands, $ in Thousands	USD ($)	EUR (€)	SGD	USD ($)	JPY (¥)	AUD	HKD
Derivative [Line Items]
Decrease in fair value	$ 100
Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Notional amount				$ 71,014
US dollar | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Notional amount				31,600
Euro | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Notional amount		€ 14,600		16,428
Japanese yen | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Notional amount				14,018	¥ 1,680,000
Australian dollar | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Notional amount				3,657		AUD 5,200
Hong Kong dollar | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Notional amount				3,494			HKD 27,000
Singapore dollar | Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets
Derivative [Line Items]
Notional amount			SGD 2,600	$ 1,817

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Disclosure Inventories [Abstract]
Raw materials	$ 9,690	$ 8,143
Work in process	6,659	2,970
Finished goods	2,590	4,815
Total Inventories	$ 18,939	$ 15,928

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Disclosure Accrued Liabilities [Abstract]
Accrued payroll and benefits	$ 48,150	$ 44,610
Accrued sales rebate	7,172	11,110
Accrued sales tax and value added tax	5,650	5,456
Accrued sales and marketing expenses	6,006	5,979
Accrued accounts payable	8,582	5,736
Accrued warranty	2,711	3,148
Accrued professional fees	3,841	2,494
Accrued income taxes	2,400	2,027
Other accrued liabilities	11,402	7,320
Total Accrued Liabilities	$ 95,914	$ 87,880

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details)	9 Months Ended
	Sep. 30, 2015
Disclosure Balance Sheet Components Additional Information [Abstract]
Scanners, Warranty period	1 year

Warranty Accrual Activity (Deta

Warranty Accrual Activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 3,148	$ 3,104
Charged to cost of revenues	1,308	1,529
Actual warranty expenditures	(1,745)	(1,370)
Balance at end of period	$ 2,711	$ 3,263

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill and intangible assets, net	$ 79,715	$ 82,056

Change in Carrying Value of Goo

Change in Carrying Value of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2014	$ 82,056
Balance as of September 30, 2015	79,715
Clear Aligner [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2014	61,369
Adjustments	(391)	[1]
Balance as of September 30, 2015	$ 60,978
[1]	The adjustments to goodwill during the nine months ended September 30, 2015 were due to foreign currency translation.

Intangible Assets as Direct Res

Intangible Assets as Direct Result from Cadent Acquisition (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, beginning balance	$ 53,485	$ 53,485
Accumulated Amortization	(15,490)	(13,540)
Accumulated Impairment Loss	(19,258)	(19,258)
Net Carrying Value, ending balance	$ 18,737	$ 20,687
Trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	15 years	15 years
Gross Carrying Amount, beginning balance	$ 7,100	$ 7,100
Accumulated Amortization	(1,457)	(1,354)
Accumulated Impairment Loss	(4,179)	(4,179)
Net Carrying Value, ending balance	$ 1,464	$ 1,567
Existing technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	13 years	13 years
Gross Carrying Amount, beginning balance	$ 12,600	$ 12,600
Accumulated Amortization	(3,437)	(3,015)
Accumulated Impairment Loss	(4,328)	(4,328)
Net Carrying Value, ending balance	$ 4,835	$ 5,257
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	11 years	11 years
Gross Carrying Amount, beginning balance	$ 33,500	$ 33,500
Accumulated Amortization	(10,492)	(9,095)
Accumulated Impairment Loss	(10,751)	(10,751)
Net Carrying Value, ending balance	$ 12,257	$ 13,654
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	8 years	8 years
Gross Carrying Amount, beginning balance	$ 285	$ 285
Accumulated Amortization	(104)	(76)
Accumulated Impairment Loss	0	0
Net Carrying Value, ending balance	$ 181	$ 209

Total Estimated Annual Future A

Total Estimated Annual Future Amortization Expense for Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Disclosure Total Estimated Annual Future Amortization Expense For Acquired Intangible Assets [Abstract]
Remainder of 2015	$ 650
2,015	2,600
2,016	2,600
2,017	2,600
2,018	2,592
Thereafter	7,695
Net Carrying Value, ending balance	$ 18,737	$ 20,687

Goodwill and Long-lived Asset40

Goodwill and Long-lived Assets Narrative (Details) - Clear Aligner [Member] - USD ($) $ in Millions	Apr. 30, 2013	Apr. 29, 2011
Cadent Holdings, Inc. [Member]
Goodwill [Line Items]
Goodwill acquired		$ 58
ICA Holdings Pty Limited [Member]
Goodwill [Line Items]
Goodwill acquired	$ 3.6

Credit Facilities - Additional

Credit Facilities - Additional Information (Details) - USD ($) $ in Millions	Mar. 22, 2013	Sep. 30, 2015
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Revolving Credit Facility [Member] | Wells Fargo [Member]
Line of Credit Facility [Line Items]
Line of credit, available borrowings	$ 50
Unrestricted Cash Deposit		$ 50
Letter of Credit [Member] | Wells Fargo [Member]
Line of Credit Facility [Line Items]
Line of credit, available borrowings	$ 10
Line of Credit Facility, Amount Outstanding		$ 0

Minimum Future Lease Payments f

Minimum Future Lease Payments for Non-Cancelable Leases (Details) $ in Thousands	Sep. 30, 2015USD ($)
Disclosure Minimum Future Lease Payments For Non Cancelable Leases [Abstract]
Remainder of 2015	$ 2,594
2,015	9,982
2,016	5,952
2,017	2,409
2,018	529
Thereafter	438
Total minimum lease payments	$ 21,904

Stock-based Compensation - Addi

Stock-based Compensation - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)shares
Incentive Plan 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance	23,283,379
Number of shares available for issuance	5,371,675
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	1,133,749
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unamortized compensation cost | $	$ 75
Weighted average period of total unamortized cost (in years)	2 years 3 months
Market Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unamortized compensation cost | $	$ 16.2
Weighted average period of total unamortized cost (in years)	1 year 7 months 6 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%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unamortized compensation cost | $	$ 2.8
Weighted average period of total unamortized cost (in years)	9 months 18 days

Stock-Based Compensation Expens

Stock-Based Compensation Expense Related to All Stock-Based Awards and Employee Stock Purchases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 14,661	$ 9,910	$ 39,135	$ 29,348
Cost of net revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	984	867	2,929	2,648
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	11,564	7,381	30,106	21,748
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,113	$ 1,662	$ 6,100	$ 4,952

Activity Under Stock Option Pla

Activity Under Stock Option Plans (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Number of Shares Underlying Stock Options
Outstanding as of December 31, 2014	668
Granted	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares	$ 0
Exercised	(129)
Cancelled or expired	0
Outstanding as of September 30, 2015	539
Vested and expected to vest at September 30, 2015	539
Exercisable at September 30, 2015	539
Weighted Average Exercise Price per Share
Outstanding as of December 31, 2014 | $ / shares	$ 15.57
Exercised | $ / shares	16.47
Cancelled or expired | $ / shares	0
Outstanding as of September 30, 2015 | $ / shares	15.36
Vested and expected to vest at June 30, 2014 (usd per share) | $ / shares	15.36
Exercisable at June 30, 2014 (usd per share) | $ / shares	$ 15.36
Weighted Average Remaining Contractual Term
Outstanding as of September 30, 2015	2 years 3 months 11 days
Vested and expected to vest at September 30, 2015	2 years 3 months 11 days
Exercisable at September 30, 2015	2 years 3 months 11 days
Aggregate Intrinsic Value
Outstanding as of September 30, 2015 | $	$ 22,300
Vested and expected to vest at September 30, 2015 | $	22,300
Exercisable at September 30, 2015 | $	$ 22,300

Summary of Nonvested Shares (De

Summary of Nonvested Shares (Details) - Restricted Stock Units (RSUs) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Number of Shares Underlying RSUs
Nonvested as of December 31, 2014	2,124
Granted	835
Vested and released	(661)
Forfeited	(80)
Nonvested as of September 30, 2015	2,218
Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2014 | $ / shares	$ 0
Granted | $ / shares	0
Vested and released | $ / shares	0
Forfeited | $ / shares	0
Nonvested as of September 30, 2015 | $ / shares	$ 50
Weighted Remaining Vesting Period
Nonvested as of September 30, 2015	1 year 4 months 2 days
Aggregate Intrinsic Value
Nonvested as of September 30, 2015 | $	$ 125,883

Summary of MSU Performance (Det

Summary of MSU Performance (Details) - Market Performance Based Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)$ / sharesshares
Number of Shares Underlying MSUs
Nonvested as of December 31, 2014	498
Granted	289
Vested and released	(162)
Forfeited	(14)
Nonvested as of September 30, 2015	611
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Roll Forward
Nonvested as of December 31, 2014 | $ / shares	$ 42,000
Granted | $ / shares	62,000
Vested and released | $ / shares	30,000
Forfeited | $ / shares	54,000
Nonvested as of September 30, 2015 | $ / shares	$ 51,410
Weighted Average Remaining Vesting Period
Nonvested as of September 30, 2015	1 year 6 months 18 days
Aggregate Intrinsic Value
Nonvested as of September 30, 2015 | $	$ 34,689

Stock-based Compensation Stock-

Stock-based Compensation Stock-based Compensation Employee Stock Purchase Plan (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected term (in years)	1 year 2 months 12 days	1 year 3 months 18 days	1 year 2 months 12 days	1 year 2 months 12 days
Expected volatility	27.90%	35.80%	31.10%	38.80%
Risk-free interest rate	0.41%	0.20%	0.29%	0.20%
Expected dividends	0.00%	0.00%	0.00%	0.00%
Weighted average fair value at grant date (USD per Share)	$ 17.10	$ 16.44	$ 16.19	$ 17.15

Common Stock Repurchase Progr49

Common Stock Repurchase Program - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	Jul. 30, 2015	Jul. 29, 2015	Apr. 28, 2015	Jul. 29, 2014	Apr. 28, 2014	Apr. 23, 2014	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jan. 31, 2015
Share Repurchases [Line Items]
Repurchase of common stock, common stock authorized						$ 300				$ 100
Stock repurchase program, period						3 years
Stock repurchase program, authorized amount for next twelve months						$ 100
Accelerated share repurchase, contracted amount of repurchase			$ 70		$ 70
Payments under accelerated share repurchase agreement			$ 70
Treasury Stock, Shares, Acquired			800
Stock Repurchased During Period, Shares							300	30	600
Stock Repurchased During Period, Average Price Per Share							$ 57.04	$ 57.49	$ 50.93
Stock Repurchased During Period, Value							$ 18.8	$ 1.8	$ 28.2
Accelerated Share Repurchase Program [Member]
Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired	0	0		1,400
Share Repurchases Price Paid Per Share	$ 60.52			$ 51.46
April 2014 Stock Repurchase Program [Member]
Share Repurchases [Line Items]
Remaining authorized amount							111.2
Repurchases expected in next six months							$ 11.2

Accounting for Income Taxes - A

Accounting for Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Taxes [Line Items]
Provision for income taxes	$ 8,862	$ 11,301	$ 31,306	$ 34,301
Effective income tax rate, continuing operations	24.30%	22.80%	24.80%	24.40%
Statutory rate			35.00%
Valuation allowance, deferred tax asset	$ 32,800		$ 32,800
Unrecognized tax benefits	$ 37,800		$ 37,800		$ 33,100
Tax Holiday effect		$ 7,700		$ 22,800
Tax holiday effect on diluted earnings per share	$ 0.10	$ 0.09	$ 0.30	$ 0.28
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Foreign income tax rate			30.00%
Tax Holiday effect	$ 8,200		$ 24,600
Restatement Adjustment [Member]
Income Taxes [Line Items]
Provision for income taxes				$ 1,800

Computation of Basic and Dilute

Computation of Basic and Diluted Net Profit Per Share Attributable to Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Disclosure Computation Of Basic And Diluted Net Profit Per Share Attributable To Common Stock [Abstract]
Net income	$ 27,616	$ 38,247	$ 95,143	$ 106,291
Weighted-average common shares outstanding, basic	79,808	80,629	80,173	80,924
Dilutive effect of potential common stock	1,284	1,385	1,403	1,519
Total shares, diluted	81,092	82,014	81,576	82,443
Net income per share, basic	$ 0.35	$ 0.47	$ 1.19	$ 1.31
Net income per share, diluted	$ 0.34	$ 0.47	$ 1.17	$ 1.29

Segments and Geographical Inf52

Segments and Geographical Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2015segment
Disclosure Segments And Geographical Information Additional Information [Abstract]
Number of reportable segments	2

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenue	[1]	$ 207,636	$ 189,876	$ 615,210	$ 563,053
Gross profit		157,576	145,054	467,300	427,781
Clear Aligner [Member]
Segment Reporting Information [Line Items]
Gross profit		156,205	141,117	461,502	415,903
Invisalign Full [Member]
Segment Reporting Information [Line Items]
Revenue		198,292	178,138	586,138	526,112
Scanners and Services
Segment Reporting Information [Line Items]
Revenue		9,344	11,738	29,072	36,941
Gross profit		$ 1,371	$ 3,937	$ 5,798	$ 11,878
[1]	Net revenues are attributed to countries based on location of where revenue is recognized.

Net Revenues by Geographic Area

Net Revenues by Geographic Area (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 207,636	$ 189,876	$ 615,210	$ 563,053
United States
Segment Reporting Information [Line Items]
Net revenues	[1]	143,933	134,244	429,005	396,837
the Netherlands
Segment Reporting Information [Line Items]
Net revenues	[1]	37,427	34,538	118,295	113,828
Other international
Segment Reporting Information [Line Items]
Net revenues	[1]	$ 26,276	$ 21,094	$ 67,910	$ 52,388
[1]	Net revenues are attributed to countries based on location of where revenue is recognized.

Long-Lived Assets by Geographic

Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Long-lived assets	[1]	$ 120,738	$ 90,125
United States
Segment Reporting Information [Line Items]
Long-lived assets	[1]	97,789	76,511
MEXICO
Segment Reporting Information [Line Items]
Long-lived assets		14,655	6,229
Other international
Segment Reporting Information [Line Items]
Long-lived assets	[1]	$ 8,294	$ 7,385
[1]	Long-lived assets are attributed to countries based on entity that owns the asset.