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Consolidated Statements of Operations and Comprehensive Loss (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Operations and Comprehensive Loss [Abstract]      
Revenue $ 1,069us-gaap_SalesRevenueGoodsNet $ 490us-gaap_SalesRevenueGoodsNet $ 346us-gaap_SalesRevenueGoodsNet
Other revenues 0us-gaap_OtherSalesRevenueNet 300us-gaap_OtherSalesRevenueNet 0us-gaap_OtherSalesRevenueNet
Total revenue 1,069us-gaap_SalesRevenueNet 790us-gaap_SalesRevenueNet 346us-gaap_SalesRevenueNet
Costs of goods sold (291)us-gaap_CostOfRevenue (464)us-gaap_CostOfRevenue (39)us-gaap_CostOfRevenue
Gross profit 778us-gaap_GrossProfit 326us-gaap_GrossProfit 307us-gaap_GrossProfit
Operating expenses      
Selling, general and administrative 15,783us-gaap_SellingGeneralAndAdministrativeExpense 20,657us-gaap_SellingGeneralAndAdministrativeExpense 27,963us-gaap_SellingGeneralAndAdministrativeExpense
Research and development 4,299us-gaap_ResearchAndDevelopmentExpense 12,688us-gaap_ResearchAndDevelopmentExpense 26,215us-gaap_ResearchAndDevelopmentExpense
Total operating expenses 20,082us-gaap_CostsAndExpenses 33,345us-gaap_CostsAndExpenses 54,178us-gaap_CostsAndExpenses
Operating loss (19,304)us-gaap_OperatingIncomeLoss (33,019)us-gaap_OperatingIncomeLoss (53,871)us-gaap_OperatingIncomeLoss
Change in fair value of warrant liability, net 1,942us-gaap_FairValueAdjustmentOfWarrants 2,756us-gaap_FairValueAdjustmentOfWarrants 2,159us-gaap_FairValueAdjustmentOfWarrants
Interest income 5us-gaap_InvestmentIncomeInterest 20us-gaap_InvestmentIncomeInterest 19us-gaap_InvestmentIncomeInterest
Other expense and interest expense (24)dcth_OtherNonoperatingIncomeInterestExpense (81)dcth_OtherNonoperatingIncomeInterestExpense (175)dcth_OtherNonoperatingIncomeInterestExpense
Net Loss (17,381)us-gaap_NetIncomeLoss (30,324)us-gaap_NetIncomeLoss (51,868)us-gaap_NetIncomeLoss
Common share data:      
Basic loss per share (in dollars per share) $ (1.84)us-gaap_EarningsPerShareBasic [1] $ (4.81)us-gaap_EarningsPerShareBasic [1] $ (13.54)us-gaap_EarningsPerShareBasic [1]
Diluted loss per share (in dollars per share) $ (1.84)us-gaap_EarningsPerShareDiluted [1] $ (5.10)us-gaap_EarningsPerShareDiluted [1] $ (13.54)us-gaap_EarningsPerShareDiluted [1]
Weighted average number of basic common shares outstanding (in shares) 9,452,050us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 6,300,614us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 3,829,721us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]
Weighted average number of diluted common shares outstanding (in shares) 9,452,050us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 6,569,011us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1] 3,829,721us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding [1]
Other comprehensive income (loss):      
Foreign currency translation adjustments (76)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 59us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 37us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Comprehensive loss $ (17,457)us-gaap_ComprehensiveIncomeNetOfTax $ (30,265)us-gaap_ComprehensiveIncomeNetOfTax $ (51,831)us-gaap_ComprehensiveIncomeNetOfTax
[1] Reflects a one-for-sixteen (1:16) reverse stock split effected on April 8, 2014.