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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts receivable, allowance for doubtful accounts and returns $ 1,461algn_AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent $ 1,563algn_AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent
Preferred stock, par value (in usd per share) $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000us-gaap_PreferredStockSharesAuthorized 5,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value (in usd per share) $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 200,000us-gaap_CommonStockSharesAuthorized 200,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 80,734us-gaap_CommonStockSharesIssued 80,205us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 80,734us-gaap_CommonStockSharesOutstanding 80,205us-gaap_CommonStockSharesOutstanding