Purchase of Intellectual Property - Additional Information (Detail) (Developed Technology Rights [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013 Y
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Purchase price for the TPM intellectual property	$ 200
Amortization period	3

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

No definition available.

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration