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Share Based Payments - Schedule of Stock Options Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Number of options, Beginning Balance | 1,635,523 | 1,019,333 | 1,004,861
Number of options, Granted | 335,000 | 1,300,000 | 120,000
Number of options, Exercised |  |  | (77,387)
Number of options, Forfeited | (425,000) | (683,810) | (28,141)
Number of options, Ending Balance | 1,545,523 | 1,635,523 | 1,019,333
Weighted average exercise price per share, Beginning Balance | $ 2.36 | $ 5.32 | $ 2.13
Number of options, Options Exercisable | 818,855 |  |
Weighted average exercise price per share, Granted | $ 1.49 | $ 1.37 | $ 1.74
Weighted average exercise price per share, Exercised |  |  | $ 0.01
Weighted average exercise price per share, Forfeited | $ 1.88 | $ 4.04 | $ 3.81
Weighted average exercise price per share, Ending Balance | $ 2.30 | $ 2.36 | $ 5.32
Aggregate fair value, Beginning Balance | $ 1,735 | $ 1,880 | $ 1,253
Weighted average exercise price per share, Options exercisable | $ 3.11 |  |
Aggregate fair value, Granted | 308 | 799 | 123
Weighted average remaining contractual term | 8 years 1 month 6 days | 8 years 7 months 6 days | 8 years
Aggregate fair value, Exercised |  |  | (307)
Weighted average remaining contractual term, Options exercisable | 7 years 4 months 24 days |  |
Aggregate fair value, Forfeited | (347) | (968) | (78)
Aggregate fair value, Ending Balance | 1,696 | 1,735 | 1,880
Aggregate fair value, Options exercisable | $ 1,050 |  |

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- Definition 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. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 + Details
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- Definition 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. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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