pre_text: Intangible assets Intangible assets include the value assigned to completed technologies, customer relationships, and trade names. The estimated useful lives for all of these intangible assets, range from two to seven years. Intangible assets as of September 30, 2019 and 2018 are summarized as follows(amounts shown in thousands, except for years): Amortization expense related to acquired intangible assets was $7.0 million, $4.0 million, and $0.6 million for fiscal years ended September 30, 2019, 2018, and 2017, respectively and is recorded in acquisition-related costs and expenses in the consolidated statements of operations.
table: September 30, 2019: Weighted Average Amortization Period Cost Accumulated Amortization Net
table: Completed technologies 6.4 years $20,341 $7,104 $13,237
table: Customer relationships 4.8 years 17,628 6,701 10,927
table: Trade names 4.5 years 618 377 241
table: Total intangible assets $38,587 $14,182 $24,405
question: Analyse this data from a financial earnings document. What is the average net value of the three categories of intangible assets in 2019?