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Restructuring Expenses (Details) (USD $)
12 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Employee
Dec. 31, 2014
Employee
Restructuring Cost and Reserve [Line Items]          
Severance costs $ 5,300,000us-gaap_SeveranceCosts1        
Operating Lease [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve charges 1,557,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
       
Restructuring Reserve [Roll Forward]          
Restructuring reserve balance 0us-gaap_RestructuringReserve
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
       
Charges 1,557,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
       
Payments / utilizations (275,000)us-gaap_PaymentsForRestructuring
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
       
Restructuring reserve balance 1,282,000us-gaap_RestructuringReserve
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
      1,282,000us-gaap_RestructuringReserve
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
Sub Lease 1 [Member]          
Restructuring Cost and Reserve [Line Items]          
Leasehold improvements written off   50,000us-gaap_ImpairmentOfLeasehold
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease1Member
     
Employee Costs [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve charges 1,324,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
       
Restructuring Reserve [Roll Forward]          
Restructuring reserve balance 2,019,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
       
Charges 1,324,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
       
Payments / utilizations (2,519,000)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
       
Restructuring reserve balance 824,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
      824,000us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Facility Closing [Member] | Sub Lease 1 [Member]          
Restructuring Cost and Reserve [Line Items]          
Outstanding lease term   81 months      
Contractual Obligation   3,600,000us-gaap_ContractualObligation
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease1Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Sub-lease revenue   2,600,000us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease1Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Net future cash outflow sub lease rental receipts   1,000,000dcth_NetFutureCashOutflowSubLeaseRentalReceipts
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease1Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Restructuring reserve charges   900,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease1Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Restructuring Reserve [Roll Forward]          
Charges   900,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease1Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
     
Facility Closing [Member] | Sub Lease 2 [Member]          
Restructuring Cost and Reserve [Line Items]          
Outstanding lease term     78 months    
Contractual Obligation     3,400,000us-gaap_ContractualObligation
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease2Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Sub-lease revenue     2,600,000us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease2Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Net future cash outflow sub lease rental receipts     800,000dcth_NetFutureCashOutflowSubLeaseRentalReceipts
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease2Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Restructuring reserve charges     700,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease2Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Restructuring Reserve [Roll Forward]          
Charges     700,000us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease2Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
   
Other non-current liabilities [Member]          
Restructuring Reserve [Roll Forward]          
Restructuring reserve balance 1,000,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
      1,000,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
Accrued Expenses [Member]          
Restructuring Reserve [Roll Forward]          
Restructuring reserve balance 300,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= dcth_CurrentAccruedExpensesMember
      300,000us-gaap_RestructuringReserve
/ us-gaap_BalanceSheetLocationAxis
= dcth_CurrentAccruedExpensesMember
Operating Expense [Member]          
Restructuring Cost and Reserve [Line Items]          
Number of positions eliminated 8us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
    50us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
58us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
Severance costs 1,300,000us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
    4,000,000us-gaap_SeveranceCosts1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OperatingExpenseMember
 
Selling, General and Administrative Expenses [Member] | Contract Termination [Member] | Sub Lease 1 [Member]          
Restructuring Cost and Reserve [Line Items]          
Contract termination costs related to sub-lease   150,000us-gaap_OtherRestructuringCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease1Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
     
Selling, General and Administrative Expenses [Member] | Contract Termination [Member] | Sub Lease 2 [Member]          
Restructuring Cost and Reserve [Line Items]          
Contract termination costs related to sub-lease     $ 150,000us-gaap_OtherRestructuringCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= dcth_SubLease2Member
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember