XML 47 R37.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation - Restricted Stock Units (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
RSUs and PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted in period (shares)     307,000    
Share-based compensation options vested in period (shares)     139,000    
Stock-based compensation expense $ 1,000,000 $ 571,000 $ 2,600,000 $ 1,200,000  
Remaining stock-based compensation expense for unvested shares, not yet recognized $ 9,200,000   $ 9,200,000    
Stock-based compensation expense, weighted average recognition period     2 years 7 months 18 days    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted in period (shares)     194,000    
Vesting period     4 years    
PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted in period (shares)     100,000   56,000
Percent of targeted performance metric 100.00%   100.00%   100.00%
Share-based compensation options vested in period (shares)     41,000    
Stock-based compensation expense         $ 479,000
Percent of achievement of award target performance metric 148.00%   148.00%    
PSUs | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of targeted performance metric 0.00%   0.00%   0.00%
PSUs | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of targeted performance metric 165.00%   165.00%   150.00%
PSUs | Vesting Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of targeted performance metric 150.00%   150.00%   150.00%
Percent of targeted awards that will vest 165.00%   165.00%   150.00%
PSUs | Vesting Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of targeted performance metric 80.00%   80.00%    
Share-based compensation options vested in period (shares)     0    
Stock-based compensation expense     $ 0    
PSUs | Vesting Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of targeted performance metric         80.00%
PSUs | Vesting Tranche Four          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percent of targeted performance metric         50.00%
Share-based compensation options vested in period (shares)     0    
Stock-based compensation expense         $ 0
2016 Performance Metric | PSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted in period (shares)     13,000