COMMON AND PREFERRED STOCK (IPO and Other Transactions) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended			3 Months Ended	1 Months Ended
	Jan. 19, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Feb. 29, 2012	Feb. 07, 2012
Class of Stock [Line Items]
Common stock, stock split ratio	8
Common stock, shares authorized	160,000,000	160,000,000	160,000,000
Preferred stock, shares authorized	40,000,000
Common stock issued (in shares)		48,748,298	47,569,463				2,900,000
Payment for stock issuance costs		$ 0	$ 0	$ 1,765
Instant Information Inc
Class of Stock [Line Items]
Stock issued in connection with acquisition (in shares)					53,336
Stock issued in connection with acquisition				640	640
IPO
Class of Stock [Line Items]
Common stock sold (in shares)						6,900,000
Gross proceeds from issuance of common stock						34,800
Conversion of preferred stock (in shares)						21,840,128
IPO | Common Stock
Class of Stock [Line Items]
Common stock sold pursuant to over-allotment option granted to underwriters (in shares)						900,000
Sale of stock price per share (in dollars per share)							12.00
Net proceeds from issuance of stock						28,969
IPO | Stockholders
Class of Stock [Line Items]
Common stock sold (in shares)						4,000,000
IPO | Underwriting Discounts and Commissions
Class of Stock [Line Items]
Payment for stock issuance costs						2,436
IPO | Offering expenses
Class of Stock [Line Items]
Payment for stock issuance costs						$ 3,395