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Stock Based Compensation (Allocated Stock-based Compensation) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Research and development              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Allocated share based compensation expense $ 35 $ 108 $ 73 $ 235 $ 298 $ 350 $ 484
General and administrative              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Allocated share based compensation expense 162 514 352 1,043 1,966 1,591 4,903
Continuing Operations              
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]              
Allocated share based compensation expense $ 197 $ 622 $ 425 $ 1,278 $ 2,264 $ 1,941 $ 5,387