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Stockholders' Equity, Stock Incentive Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2011
Warrants outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	929,495us-gaap_ClassOfWarrantOrRightOutstanding	352,664us-gaap_ClassOfWarrantOrRightOutstanding	157,063us-gaap_ClassOfWarrantOrRightOutstanding
Issued (in shares)	0dcth_ClassOfWarrantOrRightIssued	589,500dcth_ClassOfWarrantOrRightIssued	407,695dcth_ClassOfWarrantOrRightIssued
Exercised (in shares)	(49,139)dcth_ClassOfWarrantOrRightExercisesInPeriod	(12,669)dcth_ClassOfWarrantOrRightExercisesInPeriod	(185,967)dcth_ClassOfWarrantOrRightExercisesInPeriod
Expired (in shares)	(30,218)dcth_ClassOfWarrantOrRightExpiredInPeriod	0dcth_ClassOfWarrantOrRightExpiredInPeriod	(26,127)dcth_ClassOfWarrantOrRightExpiredInPeriod
Outstanding, end of period (in shares)	850,138us-gaap_ClassOfWarrantOrRightOutstanding	929,495us-gaap_ClassOfWarrantOrRightOutstanding	352,664us-gaap_ClassOfWarrantOrRightOutstanding
Warrants, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)		$ 19.2us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Outstanding, end of period (in dollars per share)			$ 19.2us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrants, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 5.40dcth_ClassOfWarrantOrRightWeightedAverageExercisePrice	$ 19.20dcth_ClassOfWarrantOrRightWeightedAverageExercisePrice	$ 56.10dcth_ClassOfWarrantOrRightWeightedAverageExercisePrice
Issued (in dollars per share)	$ 0dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceIssued	$ 7.04dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceIssued	$ 26.40dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceIssued
Exercised (in dollars per share)	$ 2.56dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceExercisesInPeriod	$ 19.20dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceExercisesInPeriod	$ 23.84dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceExercisesInPeriod
Expired (in dollars per share)	$ 2.56dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceExpirationsInPeriod	$ 0dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceExpirationsInPeriod	$ 23.84dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceExpirationsInPeriod
Outstanding, end of period (in dollars per share)	$ 5.42dcth_ClassOfWarrantOrRightWeightedAverageExercisePrice	$ 5.40dcth_ClassOfWarrantOrRightWeightedAverageExercisePrice	$ 19.20dcth_ClassOfWarrantOrRightWeightedAverageExercisePrice
Weighted average remaining life	2 years 9 months 11 days	3 years 6 months 4 days	2 years 2 months 26 days	1 year 5 months 12 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options	10 years
Stock Options, Number of Options [Roll Forward]
Outstanding, beginning of period (in shares)	252,158us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	299,242us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	258,069us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Granted (in shares)	165,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	130,328us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	75,437us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Expired (in shares)	(45,666)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	(16,874)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	(26,251)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Forfeited (in shares)	(89,757)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	(160,538)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	(8,013)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Outstanding, end of period (in shares)	281,735us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	252,158us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	299,242us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Exercisable (in shares)	55,634us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock Options, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 57.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 76.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 81.45us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Granted (in dollars per share)	$ 1.78us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 17.41us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 60.80us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Expired (in dollars per share)	$ 47.54us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 63.50us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 76.90us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Forfeited (in dollars per share)	$ 67.58us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 24.47us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 80.87us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Outstanding, end of period (in dollars per share)	$ 23.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 57.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 76.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Exercisable (in dollars per share)	$ 99.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock Options, Weighted Average Remaining Life Years [Abstract]
Outstanding	8 years 9 months 29 days	7 years 4 months 10 days	6 years 10 months 17 days	6 years 4 months 17 days
Exercisable	6 years 0 months 29 days
Assumptions used to determine the fair value of stock options [Abstract]
Weighted average risk-free interest rate (in hundredths)	1.53%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	1.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	1.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted average expected volatility (in hundredths)	96.68%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	92.31%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	79.89%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Dividend yield (in hundredths)	0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted average expected option term	4 years 6 months	5 years 7 months 28 days	6 years 2 months 1 day
Weighted average grant date fair value (in dollars per share)	$ 1.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 17.41us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 60.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Non-vested Options, Number of Options [Roll Forward]
Non-vested, beginning of period (in shares)	118,610dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	105,143dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Granted (in shares)	165,000dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	130,328dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Vested (in shares)	(46,737)dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	(42,893)dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Forfeited (in shares)	(10,772)dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedForfeitureInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	(73,968)dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedForfeitureInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Non-vested, end of period (in shares)	226,101dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	118,610dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	105,143dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Non-vested Options, Weighted Average Fair Value [Roll Forward]
Non-vested, beginning of period (in dollars per share)	$ 20.76dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 74.85dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Granted (in dollars per share)	$ 1.78dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 17.41dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Vested (in dollars per share)	$ 26.35dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 85.99dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Forfeited (in dollars per share)	$ 35.92dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 53.93dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Non-vested, end of period (in dollars per share)	$ 5.03dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 20.76dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 74.85dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock [Member]
Restricted Stock, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	20,347us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	31,267us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Granted (in shares)	62,504us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	17,258us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Vested (in shares)	(18,815)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	(19,582)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Forfeited (in shares)	(34,237)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	(8,596)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Outstanding, end of period (in shares)	29,799us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	20,347us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock, Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested, beginning of period (in dollars per share)	$ 16.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 52.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Granted (in dollars per share)	$ 2.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 6.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Vested (in dollars per share)	$ 13.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 41.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Forfeited (in dollars per share)	$ 3.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 69.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Non-vested, end of period (in dollars per share)	$ 4.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 16.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Minimum [Member]
Warrants, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)					$ 55.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember
Outstanding, end of period (in dollars per share)	$ 1.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 2.56us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember			$ 55.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Stock Options [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 4.80dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 19.68dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 19.68dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Granted (in dollars per share)	$ 1.24dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 4.80dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 22.88dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Expired (in dollars per share)	$ 4.80dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpiredInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 6.08dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpiredInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 30.08dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpiredInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Forfeited (in dollars per share)	$ 4.80dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 19.68dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 36.16dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Outstanding, end of period (in dollars per share)	$ 1.24dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 4.80dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 19.68dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Exercisable (in dollars per share)	$ 21.12dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Assumptions used to determine the fair value of stock options [Abstract]
Expected volatility (in hundredths)	95.47%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	86.16%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember	77.37%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Warrants, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)					$ 57.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember
Outstanding, end of period (in dollars per share)	$ 7.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 7.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember			$ 57.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Stock Options [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 248.64dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 248.64dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 248.64dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Granted (in dollars per share)	$ 2.42dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 34.08dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 73.60dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Expired (in dollars per share)	$ 110.40dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpiredInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 197.44dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpiredInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 72.32dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpiredInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Forfeited (in dollars per share)	$ 248.64dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 29.92dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 146.88dcth_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Outstanding, end of period (in dollars per share)	$ 245.12dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 248.64dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 248.64dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Exercisable (in dollars per share)	$ 245.12dcth_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableExercisePricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Assumptions used to determine the fair value of stock options [Abstract]
Expected volatility (in hundredths)	98.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	97.21%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember	84.81%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition

The number of each class of warrants or rights exercised during the period.

+ References

No definition available.

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The number of each class of warrants or rights that expired during the period.

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No definition available.

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Weighted average exercise price for warrants or rights outstanding.

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No definition available.

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- Definition

Weighted average exercise price for warrants or rights to acquire and convert their warrants into shares that were exercised during the period.

+ References

No definition available.

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- Definition

Weighted average exercise price per share for warrants or rights for securities that expired in period.

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No definition available.

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- Definition

Weighted average exercise price for the number of warrants or rights issued for the unvested, forfeitable warrants or rights in period.

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No definition available.

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- Definition

Weighted average remaining contractual term for each class of warrants or rights outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Exercise price per share as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

No definition available.

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- Definition

Weighted average fair value as of the grant date of stock options that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

No definition available.

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- Definition

The weighted average fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

No definition available.

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- Definition

The number of nonvested share options (or share units) that were forfeited during the reporting period.

+ References

No definition available.

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- Definition

Gross number of non-vested share options (or share units) granted during the period.

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No definition available.

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- Definition

The number of non-vested shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date.

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No definition available.

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- Definition

The number of non-vested share options (or share units) that vested during the reporting period.

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No definition available.

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Exercise price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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No definition available.

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- Definition

The weighted average fair value of options outstanding.

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No definition available.

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- Definition

The weighted average fair value of awards on equity-based option plans which vested during the reporting period.

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No definition available.

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Term of equity-based payment award.

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Exercise price at which grantees could have acquired the underlying shares with respect to stock options that were expired.

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No definition available.

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Exercise price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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No definition available.

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- Definition

Exercise price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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No definition available.

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Exercise price per share or per unit of warrants or rights outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Section S99

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Number of warrants or rights outstanding.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Name Accounting Standards Codification

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (c)(2)(iii)(2)

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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-Section 50

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-Subparagraph (c)(2)(iii)(2)

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)(iii)

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 14.D.2)

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-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

-Subparagraph (f)(2)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (f)(2)(iv)

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Weighted average expected volatility rate of share-based compensation awards.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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