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

Intangible Assets - Schedule of Intangible Assets (Details)

v3.8.0.1
Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Total intangibles $ 9,587 $ 9,587 $ 9,587
Less accumulated amortization (6,802) (6,400) (5,900)
Total intangibles net of amortization 2,785 3,187 3,687
Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total intangibles 350 350 350
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total intangibles 3,990 3,990 3,990
Developed Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total intangibles 4,685 4,685 4,685
Other Patents And Patent Applications [Member]      
Finite-Lived Intangible Assets [Line Items]      
Total intangibles $ 562 $ 562 $ 562