XML 46 R45.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements - Schedule of Quantitative Information for Level 3 Fair Value Measurements (Detail) (Level 3 [Member])
 3 Months Ended
Mar. 31, 2015
Contingent Consideration [Member] | Minimum [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Discount rate 17.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_ContingentConsiderationLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Probability of occurrence 0.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_ContingentConsiderationLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Contingent Consideration [Member] | Minimum [Member] | Probability Weighted Income Approach [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Milestone dates 2019
Contingent Consideration [Member] | Maximum [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Discount rate 24.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_ContingentConsiderationLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Probability of occurrence 100.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_ContingentConsiderationLiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Contingent Consideration [Member] | Maximum [Member] | Probability Weighted Income Approach [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Milestone dates 2022
Royalties [Member] | Minimum [Member] | Discounted Cash Flow [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Discount rate 4.80%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_RoyaltiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= htwr_DiscountedCashFlowMember
Royalties [Member] | Maximum [Member] | Discounted Cash Flow [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Discount rate 7.80%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_RoyaltiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= htwr_DiscountedCashFlowMember
Lease Exit Costs [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Sublease rate 26.50htwr_SubleaseRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_LeaseExitCostMember
Discount rate 3.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= htwr_LeaseExitCostMember
Lease Exit Costs [Member] | Discounted Cash Flow [Member]
  
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]  
Sublease start date July 1,2016