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Commitments (Details) | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 Office Space in New York, New York, Initial Lease [Member] USD ($) sqft | Dec. 31, 2013 Office Space in New York, New York, Lease Amendment [Member] USD ($) sqft | Dec. 31, 2013 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 1 [Member] USD ($) | Dec. 31, 2013 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 2 [Member] USD ($) | Dec. 31, 2013 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 3 [Member] USD ($) | Dec. 31, 2013 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 4 [Member] USD ($) | Dec. 31, 2013 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 5 [Member] USD ($) | Dec. 31, 2013 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Years Thereafter [Member] USD ($) | Dec. 31, 2013 Facility lease agreement [Member] USD ($) sqft | Dec. 31, 2013 Country Club Road lease agreement [Member] USD ($) sqft | Dec. 31, 2013 Park Road lease agreement [Member] USD ($) sqft | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] sqft | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 1 [Member] USD ($) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 1 [Member] EUR (€) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 2 [Member] USD ($) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 2 [Member] EUR (€) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 3 [Member] USD ($) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 3 [Member] EUR (€) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 4 [Member] USD ($) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 4 [Member] EUR (€) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 5 [Member] USD ($) | Dec. 31, 2013 Delcath's European headquarters lease agreement [Member] Year 5 [Member] EUR (€)
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square footage of office space (in square feet) |  |  |  | 8,629 |  |  |  |  |  |  |  | 10,320 | 18,000 | 6,000 | 19,200 |  |  |  |  |  |  |  |  |  |
Expansion option, additional square footage of office space (in square feet) |  |  |  | 8,629 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent payment in years 1-3 and first half of year 4 |  |  |  | $ 457,337 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent payment in second half of year 4 and years 5-7 |  |  |  | 491,853 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional square footage of office space leased under exercise of option right (in square feet) |  |  |  |  | 8,629 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease expiration date |  |  |  |  | Mar. 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent payment in years 1-5 |  |  |  |  | 504,078 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual base rent payment in years 6-11 |  |  |  |  | 547,533 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future minimum lease payments under all operating leases [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 1,469,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 1,338,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 1,183,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 1,052,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 1,091,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total future minimum payments due | 6,133,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease term |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 1 year | 10 years |  |  |  |  |  |  |  |  |  |
Annual base rent |  |  |  | 543,627 |  | 961,000 | 970,000 | 996,000 | 996,000 | 1,000,000 | 1,100,000 |  | 216,000 | 42,000 |  | 146,009 | 106,051 | 185,830 | 134,974 | 219,015 | 159,077 | 252,198 | 183,179 | 252,198 | 183,179
Delivery time frame of written notice, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |
Purchase price which commenced on September 1, 2009 |  |  |  |  |  |  |  |  |  |  |  | 440,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Rent expense | 1,500,000 | 1,500,000 | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum letter of credit amount required to be maintained under lease agreement | $ 881,297 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date of letter of credit | Feb. 01, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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