Organization and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) customer	Dec. 31, 2014 USD ($) customer	Dec. 31, 2013 USD ($)	Apr. 30, 2015	Sep. 25, 2013 USD ($)
Accounting Policies [Line Items]
Advertising Expense	$ 700,000	$ 800,000	$ 700,000
Depreciation and amortization	$ 12,800,000	$ 11,300,000	10,900,000
Vendor-Specific Objective Evidence (VSOE) exist when (approximately 80% or more) standalone sales are within a reasonable price range	80.00%
Number of significant customers that accounted for more than 10% of accounts receivables | customer	0	0
Transferred non-recourse accounts receivables	$ 38,600,000	$ 62,000,000	41,300,000
Accounts receivables from third-party leasing companies for transferred non-recourse accounts receivables	800,000	1,100,000	100,000
Cost of application development of enterprise-level software	26,011,000	19,643,000
Capitalized software development costs	$ 92,837,000	87,677,000
Computer equipment and related software
Accounting Policies [Line Items]
Useful life	5 years
Software development costs
Accounting Policies [Line Items]
Cost of revenues for amortization of capitalized software development cost	$ 5,800,000	4,400,000	3,200,000
Minimum
Accounting Policies [Line Items]
Vendor-Specific Objective Evidence, within a reasonably narrow price range (plus or minus of median rate)	15.00%
Estimated useful lives of assets	1 year
Minimum | Computer equipment and related software
Accounting Policies [Line Items]
Useful life	3 years
Minimum | Furniture and Fixtures
Accounting Policies [Line Items]
Useful life	5 years
Minimum | Equipment
Accounting Policies [Line Items]
Useful life	3 years
Maximum
Accounting Policies [Line Items]
Vendor-Specific Objective Evidence, within a reasonably narrow price range (plus or minus of median rate)	15.00%
Estimated useful lives of assets	30 years
Maximum | Computer equipment and related software
Accounting Policies [Line Items]
Useful life	5 years
Maximum | Furniture and Fixtures
Accounting Policies [Line Items]
Useful life	7 years
Maximum | Equipment
Accounting Policies [Line Items]
Useful life	12 years
Selling, general and administrative
Accounting Policies [Line Items]
Shipping and handling expenses	$ 8,500,000	7,400,000	6,100,000
Capitalized software costs included in property and equipment
Accounting Policies [Line Items]
Cost of application development of enterprise-level software	1,200,000	3,900,000
Capitalized software costs included in other assets | Software development costs
Accounting Policies [Line Items]
Capitalized software development costs	12,100,000	10,400,000
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit
Accounting Policies [Line Items]
Revolving credit facility					$ 75,000,000
Foreign Exchange Forward
Accounting Policies [Line Items]
Derivative, notional amount	400,000
Primary Supplier
Accounting Policies [Line Items]
Minimum supplier purchase obligations	$ 0
Notice of termination, time upon delivery	2 months
Payments to suppliers	$ 41,700,000	$ 34,500,000	$ 29,200,000
New Accounting Pronouncement, Early Adoption, Effect
Accounting Policies [Line Items]
Net current deferred tax assets	$ 12,500,000
Credit Concentration Risk | Lease Receivable
Accounting Policies [Line Items]
Percentage of lease receivable balance	75.00%
Avantec Heathcare Limited
Accounting Policies [Line Items]
Percentage of interest acquired				85.00%