5. Capitalized Content Development Costs

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

	December 31, 2013			June 30, 2014
Capitalized content development costs	$	11,816		$	14,894
Capitalized content development costs in process	1,961			2,412
Accumulated amortization	(4,873		)	(6,272		)
Capitalized content development costs, net	$	8,904		$	11,034

The Company recorded amortization expense related to capitalized content development costs of $0.5 million and $0.7 million for the three months ended June 30, 2013 and 2014, respectively. The Company recorded amortization expense related to capitalized content development costs of $1.0 million and $1.4 million for the six months ended June 30, 2013 and 2014, respectively.

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

2014	$	1,450
2015	2,589
2016	2,117
2017	1,473
2018	903
Thereafter	90
Total	$	8,622