Stock Option Plans - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares to be issued upon exercise of options	1,100,000
2012 Equity Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares authorized for issuance	3,993,300
Increase in shares available for issuance percentage on common stock outstanding		4.00%