Stockholders' Equity - Shares of Common Stock Issuable on Conversion or Exercise of Rights Granted (Detail)	Dec. 31, 2015 shares
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Total common shares	25,983,135
Exercise of Issued Warrants [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Total common shares	445,000
2018 Convertible Notes [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Total common shares	11,401,284
Employee Stock Option [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Total common shares	13,836,851
Management Incentive Plan Restricted Stock Units [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Total common shares	260,000
Series E Convertible Voting Preferred Stock [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Total common shares	40,000