Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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
Research and development expense	$ 47,324	$ 43,154	$ 29,922
Impairments of intangible assets	0	0	0
Impairments of long-lived assets	0	0	0
Purchase of held to maturity securities	$ 63,800
Grade corporate and municipal bonds, maturity date	2017 through 2021
Cash and cash equivalents	$ 185,926	36,151	$ 33,087	$ 206,167
Unbilled receivables	42,600	33,600
Retention payable after completion of the contract	7,200	$ 5,000
Convertible Preferred Stock | Record Holdings Pty Limited
Accounting Policies [Line Items]
Cost method investment	$ 15,000
Investment percentage	20.00%
Minimum
Accounting Policies [Line Items]
Multiple-deliverable arrangements, term	5 years
Vesting period (in years)	3 years
Percentage of retention of billing	5.00%
Maximum
Accounting Policies [Line Items]
Multiple-deliverable arrangements, term	7 years
Vesting period (in years)	6 years
Percentage of retention of billing	20.00%
Stock Option Plan
Accounting Policies [Line Items]
Contractual term (in years)	10 years
Stock Option Plan | Minimum
Accounting Policies [Line Items]
Vesting period (in years)	3 years
Stock Option Plan | Maximum
Accounting Policies [Line Items]
Vesting period (in years)	6 years