5. Capitalized Content Development Costs

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

	December 31, 2013			March 31, 2014
Capitalized content development costs	$	11,816		$	13,703
Capitalized content development costs in process	1,961			1,520
Accumulated amortization	(4,873		)	(5,543		)
Capitalized content development costs, net	$	8,904		$	9,680

The Company recorded amortization expense related to capitalized content development costs of $0.5 million and $0.7 million for the three months ended March 31, 2013 and March 31, 2014, respectively.

As of March 31, 2014, the estimated future amortization expense for the capitalized content costs is as follows (in thousands):

2014	$	1,995
2015	2,368
2016	1,879
2017	1,235
2018	665
Thereafter	18
Total	$	8,160