Annual report pursuant to Section 13 and 15(d)

Intangible assets, net - Aggregate Amortization Expense (Details)

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Intangible assets, net - Aggregate Amortization Expense (Details)
Dec. 31, 2018
USD ($)
Estimated aggregate amortization expense  
Estimated amortization expense for 2019 $ 659,000
Estimated amortization expense for 2020 360,000
Estimated amortization expense for 2021 137,000
Estimated amortization expense for 2022 23,000
Estimated amortization expense for 2023 $ 13,000