5.Capitalized Content Development Costs

Capitalized content development costs consisted of the following as of (in thousands):

	December 31, 2013			September 30, 2014
Capitalized content development costs	$	11,816		$	16,076
Capitalized content development costs in process	1,961			2,353
Accumulated amortization	(4,873		)	(6,604		)
Capitalized content development costs, net	$	8,904		$	11,825

The Company recorded amortization expense related to capitalized content development costs of $0.5 million and $1.0 million for the three months ended September 30, 2013 and 2014, respectively. The Company recorded amortization expense related to capitalized content development costs of $1.5 million and $2.4 million for the nine months ended September 30, 2013 and 2014, respectively.

As of September 30, 2014, the estimated future amortization expense for the capitalized content development costs is as follows (in thousands):

2014	$	762
2015	2,860
2016	2,423
2017	1,829
2018	1,272
Thereafter	326
Total	$	9,472