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

Debt - Schedule of Outstanding Long-Term Debt (Details)

v3.8.0.1
Debt - Schedule of Outstanding Long-Term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total debt, outstanding principal   $ 7,421 $ 17,814
Total debt, unamortized discount and debt issuance costs   (409) (1,449)
Total debt, net carrying amount   7,012 16,365
Current portion, outstanding principal $ (4,877) (7,421) (17,814)
Current portion, unamortized discount and debt issuance costs 263 409 1,449
Current portion, net carrying amount (4,614) (7,012) (16,365)
Long-term debt, outstanding principal
Long-term debt, unamortized discount and debt issuance costs
Long-term debt
Hercules Term Loan [Member]      
Debt Instrument [Line Items]      
Total debt, outstanding principal 2,377 7,421 763
Total debt, unamortized discount and debt issuance costs (58) (409) (29)
Total debt, net carrying amount 2,319 7,012 734
North Stadium Term Loan [Member]      
Debt Instrument [Line Items]      
Total debt, outstanding principal 2,500  
Total debt, unamortized discount and debt issuance costs (205)  
Total debt, net carrying amount $ 2,295  
Magna Note [Member]      
Debt Instrument [Line Items]      
Total debt, outstanding principal   17,051
Total debt, unamortized discount and debt issuance costs   (1,420)
Total debt, net carrying amount   $ 15,631