Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

v3.7.0.1
Acquisitions (Details)
3 Months Ended 6 Months Ended
Jul. 02, 2016
USD ($)
Employees
shares
Jun. 30, 2017
USD ($)
Mar. 31, 2017
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Jun. 30, 2016
USD ($)
Business Acquisition [Line Items]              
Stock-based compensation expense   $ 10,968,000   $ 8,417,000 $ 22,335,000   $ 15,933,000
Purchase price [Abstract]              
Cash consideration         0   573,000
Allocation of purchase price [Abstract]              
Goodwill   239,705,000     239,705,000 $ 239,705,000  
Identifiable Intangible Assets, Weighted Average Estimated Useful Life [Abstract]              
Amortization of acquired intangible assets per quarter   4,000,000   $ 3,200,000 $ 8,000,000   $ 6,600,000
Maximum [Member]              
Business Acquisition [Line Items]              
Option vesting period         5 years    
ShippingEasy [Member]              
Business Acquisition [Line Items]              
Percentage of voting interests acquired 100.00%            
Earnings target percentage     100.00%     100.00%  
Stock-based compensation expense   $ 1,200,000     $ 2,500,000 $ 1,900,000  
Stock-based compensation expense (in shares) | shares           21,783  
Stock-based compensation expense, percentage         50.00% 100.00%  
Shares issued and distributed (in shares) | shares     15,113        
Shares withheld to satisfy income tax obligations (in shares) | shares     6,670        
Purchase price [Abstract]              
Cash consideration $ 55,000,000            
Allocation of purchase price [Abstract]              
Trade accounts receivable 1,194,000            
Other assets 76,000            
Property and equipment 40,000            
Goodwill 40,953,000            
Identifiable intangible assets 15,679,000            
Accrued expenses and other liabilities (707,000)            
Deferred revenue (185,000)            
Deferred tax liability (1,603,000)            
Total purchase price 55,447,000            
Less: settlement of preexisting relationship (accounts receivable) 1,194,000            
Purchase price, net of settlement $ 54,253,000            
Identifiable Intangible Assets, Weighted Average Estimated Useful Life [Abstract]              
Identifiable intangible assets, weighted average estimated useful life         5 years    
Discount rate of net cash flows to their present values 23.00%            
Amortization of acquired intangible assets per quarter $ 761,000            
ShippingEasy [Member] | Minimum [Member]              
Business Acquisition [Line Items]              
Percentage of awards subject to proration 75.00%            
ShippingEasy [Member] | Trademark [Member]              
Allocation of purchase price [Abstract]              
Identifiable intangible assets $ 1,304,000            
Identifiable Intangible Assets, Weighted Average Estimated Useful Life [Abstract]              
Identifiable intangible assets, weighted average estimated useful life         8 years    
ShippingEasy [Member] | Developed Technology [Member]              
Allocation of purchase price [Abstract]              
Identifiable intangible assets 6,948,000            
Identifiable Intangible Assets, Weighted Average Estimated Useful Life [Abstract]              
Identifiable intangible assets, weighted average estimated useful life         5 years    
ShippingEasy [Member] | Non-Compete Agreement [Member]              
Allocation of purchase price [Abstract]              
Identifiable intangible assets 1,111,000            
ShippingEasy [Member] | Non-Compete Agreement [Member] | Minimum [Member]              
Identifiable Intangible Assets, Weighted Average Estimated Useful Life [Abstract]              
Identifiable intangible assets, weighted average estimated useful life         3 years    
ShippingEasy [Member] | Non-Compete Agreement [Member] | Maximum [Member]              
Identifiable Intangible Assets, Weighted Average Estimated Useful Life [Abstract]              
Identifiable intangible assets, weighted average estimated useful life         5 years    
ShippingEasy [Member] | Customer Relationships [Member]              
Allocation of purchase price [Abstract]              
Identifiable intangible assets $ 6,316,000            
Identifiable Intangible Assets, Weighted Average Estimated Useful Life [Abstract]              
Identifiable intangible assets, weighted average estimated useful life         5 years    
ShippingEasy [Member] | General Manager and Chief Technology Officer [Member]              
Business Acquisition [Line Items]              
Period of performance based inducement equity awards   2 years 6 months          
ShippingEasy [Member] | General Manager and Chief Technology Officer [Member] | Maximum [Member]              
Business Acquisition [Line Items]              
Aggregate shares issued (in shares) | shares 43,567            
ShippingEasy [Member] | New Employee [Member]              
Business Acquisition [Line Items]              
Aggregate shares issued (in shares) | shares 62,000            
Shares granted for number of new employees | Employees 48            
Vesting term         10 years    
ShippingEasy [Member] | Vesting Option One [Member] | New Employee [Member]              
Business Acquisition [Line Items]              
Percentage of options vesting 25.00%            
Option vesting period         1 year    
ShippingEasy [Member] | Vesting Option Two [Member]              
Business Acquisition [Line Items]              
Percentage of options vesting 75.00%            
Option vesting period         36 months