Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018		Dec. 31, 2017	Jun. 30, 2017		Dec. 31, 2016
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 46,533		$ 14,472	$ 32,388
Restricted cash	175		5,333	5,997
Total cash and restricted cash	$ 46,708	[1]	$ 19,805	$ 38,385	[1]	$ 29,857

[1] (a) The following table provides a reconciliation of cash and restricted cash to amounts reported within the condensed consolidated balance sheets: Cash and cash equivalents $46,533 $32,388 Restricted cash 175 5,997 Total cash and restricted cash $46,708 $38,385