XML 85 R72.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation - Summary of Nonvested Stock Awards Activity (Details) - Nonvested stock awards (including restricted stock, restricted stock units and performance-based restricted stock units) - $ / shares
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares        
Nonvested, beginning balance (shares)   3,893,050    
Granted (shares) 183,751 792,930    
Vested (shares)   (45,002)    
Forfeited (shares)   (2,524,282)    
Nonvested, ending balance (shares)   2,116,696 3,893,050  
Weighted Average Grant Date Fair Value (Per Share)        
Nonvested, beginning balance (usd per share)   $ 4.37    
Granted (usd per share)   6.32 $ 4.86 $ 4.00
Vested (usd per share)   6.24    
Forfeited (usd per share)   4.09    
Nonvested, ending balance (usd per share)   $ 5.36 $ 4.37