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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019		Dec. 31, 2018	Jun. 30, 2018		Dec. 31, 2017
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 17,348		$ 31,213	$ 46,533
Restricted cash	50		50	175
Total cash and restricted cash	$ 17,398	[1]	$ 31,263	$ 46,708	[1]	$ 19,805
[1] The following table provides a reconciliation of cash, cash equivalents and restricted cash to amounts reported within the condensed consolidated balance sheets:

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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