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Capitalized Software Development Cost, net
6 Months Ended
Jun. 30, 2021
Research and Development [Abstract]  
Capitalized Software Development Cost, net Capitalized Software Development Costs, net
Capitalized software development costs were as follows (in thousands):
June 30,
2021
December 31,
2020
Capitalized software development costs, gross$111,042 $96,974 
Less: Accumulated amortization(71,817)(61,515)
Capitalized software development costs, net$39,225 $35,459 
Capitalized software development costs were $7.0 million and $7.1 million for the three months ended June 30, 2021 and 2020, respectively, and $14.1 million and $13.8 million for the six months ended June 30, 2021 and 2020, respectively. Amortization expense with respect to capitalized software development costs totaled $5.3 million and $4.5 million for the three months ended June 30, 2021 and 2020, respectively, and $10.3 million and $8.7 million for the six months ended June 30, 2021 and 2020, respectively.
Future amortization expense with respect to capitalized software development costs is estimated as follows (in thousands):
Years Ending December 31,
2021$10,545 
202217,432 
20239,357 
20241,891 
    Total amortization expense$39,225