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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Unrecognized tax benefits | $ 0 | $ 0
Increase in valuation allowances | 10,270,000 | 864,000
Tax liabilities | 0 |
Tax related interest | 0 |
Tax related penalties | 0 |
Domestic Tax Authority [Member] |  |
Net operating loss carry forward | 154,541,000 |
Operating loss carryforward expiration period description | 2018 through 2033 |
Excess deductions from exercise of stock option | 1,792,000 |
State and Local Jurisdiction [Member] |  |
Net operating loss carry forward | 43,747,000 |
Operating loss carryforward expiration period description | 2014 through 2033 |
Operating loss carry forward for the exercise of stock | 1,362,000 |
Foreign Tax Authority [Member] |  |
Net operating loss carry forward | 11,896,000 |
Capital Loss Carryforward [Member] | Domestic And State [Member] |  |
Operating loss carryforward expiration period description | 2014 through 2016 |
Capital loss carry forward for federal and state income tax purposes | 1,592,000 |
Research and Development [Member] | Domestic Tax Authority [Member] |  |
Operating loss carryforward expiration period description | 2018 through 2033 |
Capital loss carry forward for federal and state income tax purposes | 5,656,000 |
Research and Development [Member] | State and Local Jurisdiction [Member] |  |
Capital loss carry forward for federal and state income tax purposes | 4,962,000 |
State research and development tax credits net of federal tax effect | $ 3,275,000 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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- Definition The amount of estimated penalties recognized in the period arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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