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Commitments and Contingencies - Additional Information (Detail) ¥ in Thousands, £ in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jul. 31, 2015 GBP (£)	Jul. 31, 2015 USD ($)	May. 31, 2015 USD ($)	May. 31, 2015 JPY (¥)	Dec. 31, 2014 USD ($)	Aug. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Operating leases expenses	$ 906	$ 778	$ 2,529	$ 2,372
Stand by letter of credit decreased			$ 1,384
U.S. [Member] | Lease Arrangement One [Member]
Loss Contingencies [Line Items]
Period in which U.S. office lease expires			Jan. 01, 2014
U.S. [Member] | Lease Arrangement Two [Member]
Loss Contingencies [Line Items]
New lease agreement term			16 years
New lease agreement date			2013-08
Lease incentives received including for deferred rent period										$ 3,223
Leasehold improvement allowance	$ 509		$ 509						$ 509	$ 3,223
Japan [Member] | Lease Arrangement Three [Member]
Loss Contingencies [Line Items]
New lease agreement term			3 years
New lease agreement date			2015-05
Lease incentives received including for deferred rent period							$ 85	¥ 10,440
U.K. [Member] | Lease Arrangement Four [Member]
Loss Contingencies [Line Items]
New lease agreement term			5 years
New lease agreement date			2015-07
Lease incentives received including for deferred rent period					£ 26	$ 41

X

- Definition

This item represents the deferred credit for an incentive or inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Lease Incentive



-URI http://asc.fasb.org/extlink&oid=6516590



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 840



-SubTopic 20



-Section 55



-Paragraph 3



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-Name Accounting Standards Codification



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-Section 25



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-Name Accounting Standards Codification



-Topic 840



-SubTopic 20



-Section 25



-Paragraph 1



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+ Details

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

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X

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

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X

- Definition

This item represents a receivable for an incentive or inducement contractually stipulated between parties to a lease whereby the lessor has committed to provide the entity (lessee) with a cash payment as inducement to enter the lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 840



-SubTopic 20



-Section 25



-Paragraph 2



-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39927-112707



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-Section 25



-Paragraph 7



-URI http://asc.fasb.org/extlink&oid=7501307&loc=d3e89298-111693

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- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Letters of credit decreased amount.

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No definition available.

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- Definition

Operating Lease Agreement Date

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