XML 17 R35.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Available-for-Sale-Securities - Classification on Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Cash and cash equivalents $ 11,643 $ 5,064
Marketable securities 11,125 32,754
Total $ 22,768 $ 37,818