Stockholders' Equity - Schedule of Available Outstanding Shares for Future Issuance (Detail) - shares	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2005 Equity Incentive Plan, Shares Outstanding	7,337,598	1,914,906	144,000
2005 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2005 Equity Incentive Plan, Shares Outstanding	62,000