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Commitments
12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Commitments Commitments
 
The Company’s commitments and contingencies consisted of operating leases for warehouse and office space and equipment. Future minimum lease payments under non-cancelable operating leases are as follows (in thousands):
 
 Commitments
  
2019 $573 
2020 611 
2021 633 
2022 610 
2023 607 
2024 200 
 $3,234 

Rent expense was $0.5 million, $0.5 million and $0.9 million for the years ended December 31, 2018, 2017 and 2016, respectively.

The Company has certain licensing and development agreement in place under which the Company will pay certain licensing fees and milestones over the lives of certain projects. These commitments totaled approximately $2.4 million as of December 31, 2018, and will be paid over the next several years in accordance with agreed upon milestones.