XML 30 R17.htm IDEA: XBRL DOCUMENT v3.8.0.1
The Business and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2016
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Unrealized loss on equity investment $ 134 $ 0  
Unrealized loss on investments, net 103 (331)  
Common stock of U.S. corporation | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]      
Convertible preferred stock, shares issued upon conversion (in shares)     1,071,429
Unrealized loss on equity investment $ 100    
Unrealized loss on investments, net   $ 600