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Non Vested Stock Option Activity (Detail) (Stock Options, USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock Options |  |  |  |  |  |
Non vested shares |  |  |  |  |  |
Non vested shares, Beginning Balance | 4,571,258 |  |  |  |  |
Non vested shares, Vested | (3,436,392) |  | (279,750) | [1],[2] | (326,574) | [1],[2]
Non vested shares, Ending Balance | 1,134,866 |  | 4,571,258 |  | 5,061,974 |
Non vested shares, Granted |  |  | 1,020,000 |  | 5,739,140 | [3]
Non vested shares, Forfeitures |  |  | (1,230,966) |  | (350,592) |
Weighted-average exercise prices |  |  |  |  |  |
Non vested weighted average exercise prices, Beginning Balance | $ 2.16 | [4] | $ 1.30 | [4] |  |
Non vested weighted average exercise prices, Vested | $ 2.11 |  | $ 1.30 | [1],[2],[4] | $ 1.30 | [1],[2],[4]
Non vested weighted average exercise prices, Ending Balance | $ 2.30 |  | $ 2.16 | [4] | $ 1.30 | [4]
Non vested weighted average exercise prices, Granted |  |  | $ 4.95 | [4] | $ 1.30 | [3],[4]
Non vested weighted average exercise prices, Forfeitures |  |  | $ 1.30 | [4] | $ 1.30 | [4]
[1] | At December 31, 2012 and 2011, the aggregate intrinsic value amounted to $1.6 million and $1.2 million, respectively.
[2] | Amount of options exercisable as of December 31, 2012 and 2011, respectively. The weighted average remaining contractual term of these options is 7.85 years and 8.75 years as of December 31, 2012 and 2011, respectively.
[3] | Includes 100,000 of stock options that were not granted under the Equity Incentive Plan, but are subject to certain terms of the Equity Incentive Plan.
[4] | Exercise price was retroactively adjusted to reflect the equitable adjustment of $3.71 per share as discussed below.

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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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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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