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Cash, Cash Equivalents, and Restricted Cash (Tables)
9 Months Ended
Sep. 30, 2018
Cash, Cash Equivalents, and Restricted Cash [Abstract]  
Schedule of cash, cash equivalents, and restricted cash
  September 30,
2018
  December 31,
2017
 
  (in thousands) 
Cash and cash equivalents $45,916  $29,913 
Restricted cash—short-term included in other current assets  294   518 
Restricted cash—long-term  997   1,496 
Total cash, cash equivalents, and restricted cash $47,207  $31,927