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Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Intangible Assets
Our intangible assets consist of the following:

September 30,
2019
December 31, 2018
(in thousands)
Intellectual property$700  $700  
Less: Accumulated amortization(369) (194) 
       Total, net$331  $506  
Schedule of Amortization Expense
Amortization expense recorded in cost of sales is as follows:

  Three months endedNine months ended
 September 30,
2019
September 30,
2018
September 30,
2019
September 30,
2018
(in thousands)
Amortization expense$58  $58  $175  $136