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Accrued and Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Payables And Accruals [Abstract]  
Schedule of Accrued and Other Current Liabilities

 

December 31,

 

 

2017

 

 

2018

 

 

(in thousands)

 

Employee benefits

$

8,269

 

 

$

9,001

 

Professional fees and settlements

 

350

 

 

 

-

 

Other

 

1,088

 

 

 

1,853

 

Total

$

9,707

 

 

$

10,854