General form of registration statement for all companies including face-amount certificate companies

Property, Equipment, Improvements and Intangible Assets - Additional Information (Detail)

v3.8.0.1
Property, Equipment, Improvements and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2016
Jul. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]            
Depreciation Expense     $ 32 $ 21 $ 32 $ 26
General and administrative expense     24,722 10,723 14,935 7,990
Amortization Expense     $ 145 $ 71 119 $ 31
Expected Amortization Expense 2017         193  
Expected Amortization Expense 2018         128  
Total Expected Amortization Expense         $ 321  
Patents [Member]            
Property, Plant and Equipment [Line Items]            
General and administrative expense $ 500 $ 500