Accrued Expenses and Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2013
Payables and Accruals [Abstract]  
Schedule of accrued expenses and other current liabilities
 
2012
 
2013
Accrued compensation
$
4,265

 
$
2,787

Accrued content fees
555

 
580

Accrued business acquisition consideration
500

 
—

Unearned revenue on contracts
297

 
247

Other
1,711

 
1,563

Total
$
7,328

 
$
5,177