Incentive Stock Plan - Additional Information (Detail)
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6 Months Ended | 6 Months Ended | ||
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Jun. 30, 2012
2011 Equity Incentive Stock Plan
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Jan. 31, 2011
2011 Equity Incentive Stock Plan
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Jun. 30, 2012
2012 Equity Incentive Plan
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Apr. 30, 2012
2012 Equity Incentive Plan
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Incentive stock plan, authorized | 100,000,000 | 5,000,000 | ||
Incentive stock plan, outstanding | 984,799 | |||
Incentive stock plan, issued | 940,126 | 1,107,765 | ||
Incentive stock plan, shares available for issuance | 44,673 | 3,892,235 |