XML 111 R97.htm IDEA: XBRL DOCUMENT v3.19.1
Equity Instruments and Stock Based Compensation - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 7,852 $ 8,072 $ 14,679
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 880 672 3,523
Selling, general and administrative      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 6,972 $ 7,400 $ 11,156