v3.3.1.900
Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of loss before income taxes      
Domestic $ (26,733) $ (28,999) $ (27,953)
Loss before income taxes $ (26,733) $ (28,999) $ (27,953)
Reconciliation between statutory federal income tax rate and the effective tax rate      
U.S. statutory federal income tax rate (as a percent) 35.00% 35.00% 35.00%
U.S. state income taxes, net of federal benefits (as a percent) 7.70% 5.80% 7.30%
Non-deductible expenses (as a percent) (2.00%) (2.80%) (2.10%)
Change in valuation allowance (as a percent) (39.10%) (32.40%) (39.90%)
Other (as a percent) (1.60%) (5.60%) (0.30%)
Effective tax rate (as a percent) 0.00% 0.00% 0.00%
Deferred tax assets:      
Accrued expenses and other $ 1,899 $ 1,054  
Accrued compensation and related benefits 3,306 2,502  
Rebate reserve 167 264  
Deferred rent 282 212  
Stock-based compensation 4,971 2,782  
Net operating loss carryforwards 54,967 46,264  
Valuation allowance (54,739) (44,309)  
Total deferred tax assets 10,853 8,769  
Deferred tax liabilities:      
Other expenses (875) (1,344)  
Capitalized content development costs (7,583) (5,439)  
Capitalized software development costs (1,886) (1,346)  
Property and equipment (509) (640)  
Total deferred tax liabilities $ (10,853) $ (8,769)