XML 67 R53.htm IDEA: XBRL DOCUMENT v3.6.0.2
STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION EXPENSE FOR EMPLOYEES AND DIRECTORS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses $ 8,245 $ 8,397 $ 7,658
Research and development      
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses 1,275 2,139 2,545
Restructuring charges      
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses   307  
General and administrative      
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses $ 6,970 $ 5,951 $ 5,113