Quarterly report pursuant to Section 13 or 15(d)

Condensed Statements of Cash Flows (Parenthetical)

v3.10.0.1
Condensed Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Operating Cash Flows, Direct Method [Abstract]        
Cash and cash equivalents $ 101,796 $ 56,664 $ 62,545  
Restricted cash 50      
Total $ 101,846 $ 56,664 $ 62,545 $ 5,026