Commitments and Contingencies - Lease Obligations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
2015	$ 560
2016	583
2017	591
2018	590
2019	449
Thereafter	1,249
Total minimum lease payments	4,022
2015	41
2016	30
2017	0
2018	0
2019	0
Thereafter	0
Total minimum lease payments	71
Less: Amount representing interest	(4)
Capital lease obligation	$ 67us-gaap_CapitalLeaseObligations

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737