Annual report pursuant to section 13 and 15(d)

Incentive Stock Plan - Additional Information (Detail)

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Incentive Stock Plan - Additional Information (Detail)
12 Months Ended 12 Months Ended
Dec. 31, 2012
2011 Equity Incentive Stock Plan
Dec. 31, 2011
2011 Equity Incentive Stock Plan
Jan. 31, 2011
2011 Equity Incentive Stock Plan
Dec. 31, 2012
2012 Equity Incentive Plan
Apr. 30, 2012
2012 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Incentive stock plan, authorized     2,857,143   5,000,000
Incentive stock plan, issued 940,126 1,872,344   2,172,463  
Incentive stock plan, shares available for issuance 44,673     2,827,537