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Stockholders' Equity (Details) (USD $)
0 Months Ended 12 Months Ended
Feb. 04, 2014
Feb. 10, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stockholders' Equity (Textual) [Abstract]          
Aggregate shares issued for exercise of options     1,432,206us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 1,270,362us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 444,637us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Net proceeds from stock options exercised     $ 6,788,000us-gaap_ProceedsFromStockOptionsExercised $ 5,079,000us-gaap_ProceedsFromStockOptionsExercised $ 1,680,000us-gaap_ProceedsFromStockOptionsExercised
Shares issued related to restricted stock awards, net of any shares forfeited     789,345us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures 461,729us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures  
Underwritten public offering and issued shares 8,846,153us-gaap_StockIssuedDuringPeriodSharesNewIssues 7,820,000us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Shares sold pursuant to the full exercise of an over-allotment option granted to the underwriter 1,153,846halo_StockIssuedDuringPeriodSharesNewIssuesToUnderwriter 1,020,000halo_StockIssuedDuringPeriodSharesNewIssuesToUnderwriter      
Sale of Stock, Price Per Share $ 13.00us-gaap_SaleOfStockPricePerShare $ 10.61us-gaap_SaleOfStockPricePerShare      
Net proceeds from common stock issued 107,700,000us-gaap_ProceedsFromIssuanceOfCommonStock 81,500,000us-gaap_ProceedsFromIssuanceOfCommonStock 107,713,000us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock 81,477,000us-gaap_ProceedsFromIssuanceOfCommonStock
Purchase of common stock by affiliates   1,360,000halo_PurchaseOfCommonStockByAffiliates      
Purchase of common stock by affiliates amount   14,400,000halo_PurchaseOfCommonStockByAffiliatesAmount      
Stock options          
Stockholders' Equity (Textual) [Abstract]          
Aggregate shares issued for exercise of options     1,432,206us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
1,270,362us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Net proceeds from stock options exercised     7,800,000us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
5,500,000us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Restricted Stock Units (RSUs)          
Stockholders' Equity (Textual) [Abstract]          
Number of shares of common stock issued related to RSUs, net of RSUs surrendered as payment for withholding taxes     120,043halo_NumberOfSharesOfCommonStockIssuedRelatedToRSUsNetOfRSUsSurrenderedAsPaymentForWithholdingTaxes
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
92,201halo_NumberOfSharesOfCommonStockIssuedRelatedToRSUsNetOfRSUsSurrenderedAsPaymentForWithholdingTaxes
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Number of RSUs surrendered to pay for minimum withholding taxes     74,325halo_NumberOfRSUsSurrenderedToPayForMinimumWithholdingTaxes
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
61,923halo_NumberOfRSUsSurrenderedToPayForMinimumWithholdingTaxes
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Adjustments Related to Tax Withholding for Share-based Compensation     $ 1,000,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 400,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember