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Summary of Significant Accounting Policies Significant Accounting Policies (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Summary of Significant Accounting Policies [Line Items]          
Internal-use software development costs capitalized     $ 569,000 $ 233,000  
Tangible Asset Impairment Charges     0    
Treasury money market funds, at fair value $ 72,300,000   72,300,000   $ 127,200,000
Commercial Paper 45,000,000   45,000,000   2,500,000
Deposits, Fair Value Disclosure 6,000,000   6,000,000   $ 0
Line of Credit Facility, Amount Outstanding 0   0    
Line of Credit Facility, Maximum Borrowing Capacity 50,000,000   50,000,000    
Unamortized Debt Issuance Expense 72,000   72,000    
Income Tax Expense (Benefit) $ 227,000 $ (70,000) $ 490,000 410,000  
Effective income tax rate (1.00%) 0.00% (1.00%)    
Cloud-based product offerings [Member]          
Summary of Significant Accounting Policies [Line Items]          
Internal-use software development costs capitalized $ 510,000 $ 0 $ 582,000 $ 251,000  
Capitalized Computer Software, Amortization     $ 0    
Minimum [Member]          
Summary of Significant Accounting Policies [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     1 year 4 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year    
Maximum [Member]          
Summary of Significant Accounting Policies [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     1 year 11 months 23 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years    
Share-based Compensation Award, Tranche One [Member]          
Summary of Significant Accounting Policies [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target 25.00%   25.00%    
Share Price Target $ 27   $ 27    
Share-based Compensation Award, Tranche Two [Member]          
Summary of Significant Accounting Policies [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target 25.00%   25.00%    
Share Price Target $ 33   $ 33    
Share-based Compensation Award, Tranche Three [Member]          
Summary of Significant Accounting Policies [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Awards vesting upon Price Target 50.00%   50.00%    
Share Price Target $ 41   $ 41