Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 14,452	$ 9,892	$ 13,600	$ 18,900
Other Assets [Member]
Restricted cash	$ 100	$ 100	$ 100	$ 1,500