401 (K) PLAN - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Age	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Expense related to 401 (K) Plan	$ 0.6	$ 0.4	$ 0.3
Defined contribution plan, employers matching contribution, service period	1 year
Defined contribution plan, employers matching contribution, vesting percentage after one years of service	100.00%
Description of 401(k) plan	The Company sponsors a 401 (k) Plan ("the Plan") which is a defined contribution plan. It is available to all employees who are age 21 or older. Participants may make voluntary contributions and the Company makes matching contributions according to the Plan's matching formula. All matching contributions fully vest after one year of service. The expense related to the Plan primarily consists of the Company's matching contributions.
Age limit for eligibility to participate in the defined contribution plan	21

- Definition

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

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