Income Taxes - Operating loss carryforwards (Details) - USD ($)
$ in Thousands
2 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Net operating loss carryforwards          
Income tax benefit $ 0 $ 0 $ 0 $ 0 $ 0
Federal          
Net operating loss carryforwards          
NOL carryforwards       20,000  
State          
Net operating loss carryforwards          
NOL carryforwards       $ 45,000