Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Line Items]
Description of royalty revenue	We recognize royalty revenue when earned under the terms of our third party royalty arrangements, provided the fees are considered fixed or determinable and realization of payment is probable. Currently, our third party royalties are variable in nature and such amounts are not considered fixed or determinable until we receive notice of amounts earned. Typically, we receive notice of royalty revenues earned on a quarterly basis in the immediate quarter following the royalty reporting period.
Hosting services minimum range	1 year
Hosting services maximum range	10 years
Hosting services minimum period	3 years
Hosting services maximum period	6 years
Research and development expense	$ 25,743,000	$ 23,269,000	$ 20,140,000
Reimbursement of research and development expense			1,000,000
Purchase of intangible assets other than goodwill, percentage	80.00%
Impairments of intangible assets	0	0	0
Impairments of long-lived assets	0	0	0
Cash and cash equivalents	206,167,000	78,876,000	6,406,000	1,326,000
Unbilled receivables	14,800,000	10,800,000
Retention payable after completion of the contract	$ 4,700,000	$ 2,600,000
Minimum [Member]
Accounting Policies [Line Items]
Vesting period (in years)	3 years
Percentage of retention of billing	5.00%
Maximum [Member]
Accounting Policies [Line Items]
Vesting period (in years)	6 years
Percentage of retention of billing	20.00%
Stock Option Plan [Member]
Accounting Policies [Line Items]
Contractual term (in years)	10 years