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Intangible Assets
3 Months Ended
Jun. 30, 2019
Intangible Assets [Abstract]  
Intangible Assets
3. Intangible Assets

The following is a summary of acquired intangible assets subject to amortization:

   
June 30, 2019
  
March 31, 2019
 

Weighted
Average
Amortization
Period
 
Gross Carrying
Value
  
Accumulated
Amortization
  
Gross Carrying
Value
  
Accumulated
Amortization
 
Intangible assets subject to amortization
             
Trademarks
9 years
 
$
1,014,000
  
$
527,000
  
$
1,007,000
  
$
464,000
 
Customer relationships
11 years
  
8,668,000
   
3,764,000
   
8,610,000
   
3,547,000
 
Order backlog
6 months
  
332,000
   
332,000
   
325,000
   
180,000
 
Developed technology
5 years
  
3,054,000
   
480,000
   
2,991,000
   
311,000
 
Total
  
$
13,068,000
  
$
5,103,000
  
$
12,933,000
  
$
4,502,000
 

Amortization expense for acquired intangible assets is as follows:

  
Three Months Ended
June 30,
 
  
2019
  
2018
 
       
Amortization expense
 
$
577,000
  
$
192,000
 

The estimated future amortization expense for acquired intangible assets is as follows:

Year Ending March 31,
   
2020 - remaining nine months
 
$
1,223,000
 
2021
  
1,554,000
 
2022
  
1,512,000
 
2023
  
1,477,000
 
2024
  
1,098,000
 
Thereafter
  
1,101,000
 
Total
 
$
7,965,000