Accrued Expenses and Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2015
Payables and Accruals [Abstract]  
Schedule of accrued expenses
Accrued expenses consisted of the following as of December 31 (in thousands):
 
2014
 
2015
Accrued commissions
$
2,570

 
$
2,713

Accrued bonuses
1,104

 
1,190

Accrued salaries, wages, benefits and related costs
800

 
1,190

Accrued deferred offering costs
1,214

 
—

Accrued credit card purchases
459

 
645

Other accrued expenses and current liabilities
1,649

 
2,648

Accrued expenses and other current liabilities
$
7,796

 
$
8,386