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STOCK-BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock options |  |  |
Stock-Based Compensation |  |  |
Shares available for issuance | 2,102,942 |  |
Shares |  |  |
Options Outstanding at beginning of the period (in shares) | 5,349,810 |  |
Granted (in shares) | 1,252,000 |  |
Exercised (in shares) | (816,405) |  |
Canceled (in shares) | (14,861) |  |
Options Outstanding at the end of the period (in shares) | 5,770,544 | 5,349,810 |
Options Vested and Expected to Vest at the end of the period (in shares) | 5,712,596 |  |
Options Exercisable at the end of the period (in shares) | 3,297,190 |  |
Shares Available for Grant under the 2008 Plan (in shares) | 2,102,942 |  |
Weighted Average Exercise Price Per Share |  |  |
Options Outstanding at beginning of the period (in dollars per share) | $ 5.98 |  |
Granted (in dollars per share) | $ 16.44 |  |
Exercised (in dollars per share) | $ 6.53 |  |
Canceled (in dollars per share) | $ 6.97 |  |
Options Outstanding at the end of the period (in dollars per share) | $ 8.17 | $ 5.98 |
Options Vested and Expected to Vest at the end of the period (in dollars per share) | $ 8.12 |  |
Options Exercisable at the end of the period (in dollars per share) | $ 6.30 |  |
Weighted Average Remaining Contractual Term |  |  |
Options Outstanding at beginning of the period | 7 years | 7 years |
Options Outstanding at the end of the period | 7 years | 7 years |
Options Vested and Expected to Vest at the end of the period | 7 years |  |
Options Exercisable at the end of the period | 5 years 7 months 6 days |  |
Additional information |  |  |
Total intrinsic value of stock options exercised (in dollars) | $ 10.00 | $ 0.20 | $ 0.03
Weighted average grant-date fair value (in dollars per share) | $ 10.51 | $ 3.67 | $ 1.83
Fair value of stock options vested (in dollars) | 2.4 | 2.1 | 2.6
Aggregate intrinsic value of stock options outstanding (in dollars) | 92.6 |  |
Aggregate intrinsic value of stock options vested and expected to vest (in dollars) | 91.9 |  |
Total compensation cost not yet recognized (in dollars) | $ 14.4 |  |
Weighted average period over which compensation cost is expected to be recognized as expense | 2 years 9 months 18 days |  |
Restricted stock |  |  |
Shares |  |  |
Outstanding and unvested at the beginning of the period (in shares) | 6,000 |  |
Granted (in shares) | 12,000 |  |
Vested (in shares) | (12,000) |  |
Outstanding and unvested at the end of the period (in shares) | 6,000 |  |
Weighted Average Grant Date Fair Value (per share) |  |  |
Outstanding and unvested at the beginning of the period (in dollars per share) | $ 4.50 |  |
Granted (in dollars per share) | $ 15.20 |  |
Vested (in dollars per share) | $ 9.85 |  |
Outstanding and unvested at the end of the period (in dollars per share) | $ 15.20 |  |
Celldex Research 2005 Plan and CuraGen 2007 Plan |  |  |
Stock-Based Compensation |  |  |
Shares available for issuance | 0 |  |
Shares |  |  |
Shares Available for Grant under the 2008 Plan (in shares) | 0 |  |
2004 ESPP Plan |  |  |
Stock-Based Compensation |  |  |
Common stock reserved for issuance (in shares) | 200,000 |  |
Purchase price as a percentage of the lower of the fair market value of the common stock at either the beginning of the offering period or the applicable exercise date | 85.00% |  |
Shares issued under the plan | 11,823 | 5,935 |
Shares available for issuance | 164,124 |  |
Shares |  |  |
Shares Available for Grant under the 2008 Plan (in shares) | 164,124 |  |
2008 Plan |  |  |
Stock-Based Compensation |  |  |
Maximum shares of common stock to be issued for grants (in shares) | 7,400,000 |  |
Terms of options granted to the holders of more than 10% of the voting stock | 5 years |  |
Threshold percentage of voting stock | 10.00% |  |
Exercise price as a percentage of fair market value for options granted to the holders of more than 10% of the voting stock | 110.00% |  |
2008 Plan | Maximum |  |  |
Stock-Based Compensation |  |  |
Vesting period | 4 years |  |
Terms of options | 10 years |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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