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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]  
Schedule of future minimum lease payments under non-cancelable operating leases and purchase commitments

Future minimum lease payments under non-cancelable operating leases and purchase commitments are (in thousands):

 

 

 

Operating

 

Year ended December 31,

 

leases

 

2019

 

$

219

 

2020

 

 

186

 

Total minimum payments

 

$

405