SUBSEQUENT EVENT (Details) $ in Thousands			6 Months Ended
		Jul. 31, 2015 USD ($) Lender	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Subsequent Event [Line Items]
Prior credit facility	[1]		$ 6,000	$ 30,000
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Debt instrument, maturity date			Jul. 31, 2019
Expiration date of prior credit facility			Apr. 05, 2016
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of lenders | Lender		3
Subsequent Event [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Prior credit facility		$ 20,000
Repayment of debt including interest and fees		6,300
Subsequent Event [Member] | Letter of Credit [Member]
Subsequent Event [Line Items]
Debt instrument, principal amount		7,100
Cash collateral amount		7,400
Subsequent Event [Member] | New Credit Agreement [Member]
Subsequent Event [Line Items]
Proceeds from debt		$ 13,800
Debt instrument, interest rate (in hundredths)		11.00%
Percentage of prepayment premium any time but not including the second anniversary (in hundredths)		5.00%
Percentage of prepayment premium second anniversary but not including the third anniversary (in hundredths)		3.00%
Commitment fee		$ 1,000
Subsequent Event [Member] | New Credit Agreement [Member] | LIBOR [Member]
Subsequent Event [Line Items]
Debt instrument, variable rate (in hundredths)		9.00%
Subsequent Event [Member] | HPF Holdco, LLC [Member]
Subsequent Event [Line Items]
Debt instrument, principal amount		$ 30,000
Subsequent Event [Member] | Alostar [Member]
Subsequent Event [Line Items]
Debt instrument, principal amount		15,000
Cash collateral amount		15,300
Subsequent Event [Member] | Loan [Member]
Subsequent Event [Line Items]
Debt instrument, principal amount		$ 45,000
Percentage of debt instrument outstanding (in hundredths)		10.00%
Maximum prepayment amount of loan		$ 15,000

[1] On April 5, 2012, the Company, as borrower, and certain of its wholly-owned subsidiaries, as guarantors, entered into a secured revolving credit agreement with a syndicate of four lenders led by Bank of America, N.A., as administrative agent and letter of credit issuer (the "Credit Facility"). The April 5, 2012 agreement, along with subsequent amendments dated June 18, 2013, December 20, 2013, December 29, 2014 and March 4, 2015, are collectively referred to as the "Credit Agreement." As of December 31, 2013, the aggregate principal amount available under the Credit Facility was $60 million. Effective January 16, 2014, this amount was reduced to $40 million. Effective January 15, 2015, this amount was further reduced to $20 million. The revolving commitments available for use other than for the issuance of letters of credit under the Credit Facility have been reduced to $12 million. During the period commencing on December 1, 2015 running through January 15, 2016, the Company is required to reduce the outstanding revolving loans, other than letters of credit obligations, to $0. The Credit Facility may be used to finance capital expenditures and permitted acquisitions, to pay transaction expenses, for the issuance of letters of credit and for general corporate purposes. The Credit Agreement includes a $25 million letter of credit sublimit which was reduced to $20 million effective January 15, 2015. Borrowings under the Credit Facility are secured by a first priority lien on substantially all of the tangible and intangible assets of the Company including real estate. All net proceeds of future sales of real property by the Company and its subsidiaries must be used to prepay revolving loans and permanently reduce the principal amount of revolving loans available under the Credit Facility. The term of the Credit Facility was 36 months, maturing on April 5, 2015 but was extended for an additional 12 months with a new expiration date of April 5, 2016. Amounts borrowed under the Credit Facility bear interest, at the Company's option, at either (i) an interest rate based on LIBOR (or the rate of 1.00%, if greater) and adjusted for any reserve percentage obligations under Federal Reserve Bank regulations (the "Eurodollar Rate") for specified interest periods or (ii) the Base Rate (as defined under the Credit Facility), in each case, plus an applicable margin rate as determined under the Credit Agreement. The "Base Rate", as defined under the Credit Facility, is the highest of (a) the rate of interest announced from time to time by Bank of America, N.A. as its prime rate, (b) the Federal Funds rate plus 0.5% and (c) a daily rate equal to the one-month LIBOR rate plus 1.0%. The Fourth Amendment re-sets the margin interest rate for (a) Base Rate loans as (i) 11.0% from March 4, 2015 through April 15, 2015, (ii) 14.0% from April 16, 2015 through May 31, 2015 and (iii) 17.0% from June 1, 2015 and thereafter and (b) Eurodollar Rate loans as (i) 12.0% from March 4, 2015 through April 15, 2015, (ii) 15.0% from April 16, 2015 through May 31, 2015 and (iii) 18.0% from June 1, 2015 and thereafter. The Company is required to pay on a quarterly basis a commitment fee equal to the amount of the then unused availability under the Credit Facility multiplied by (i) 5.0%, from March 4, 2015 through April 15, 2015, (ii) 6.0%, from April 16, 2015 through May 31, 2015 and (iii) 7.0% from June 1, 2015 and thereafter. Letters of credit require a fee equal to the applicable margin rate multiplied by the daily amount available to be drawn under each issued letter of credit plus an agreed upon fronting fee and customary issuance, presentation, amendment and other processing fees associated with letters of credit. The Credit Agreement contains customary representations, warranties and covenants including consolidated adjusted net worth, consolidated leverage ratio, consolidated fixed charge coverage ratio, minimum financial responsibility composite score, cohort default rate and other financial covenants, certain restrictions on capital expenditures as well as affirmative and negative covenants and events of default customary for facilities of this type. In addition, the Company is paying fees to the lenders that are customary for facilities of this type. As of June 30, 2015, the Company is in compliance with all financial covenants. The Company paid amendment fees of $0.2 million and $0.4 million for the three and six months ended June 30, 2015 respectively, and had the Credit Facility remained outstanding, the Company would have been required to pay additional amendment fees of varying amounts on each of September 30, 2015 and December 31, 2015. At June 30, 2015, the Company had outstanding letters of credit aggregating approximately $7.0 million, which was primarily comprised of letters of credit for the DOE matters and real estate leases. During the six months ended June 30, 2015, the Company had net repayments of $30.0 million under the Credit Facility. The Company had $6.0 million outstanding under the Credit Facility as of June 30, 2015. The interest rates on borrowings ranged from 17.25% to 20.25%. The Company had $30.0 million outstanding under the Credit Agreement as of December 31, 2014 which was repaid on January 3, 2015. The interest rate on this borrowing was 7.25%. On July 31, 2015, the Company repaid in full and terminated the Credit Facility and the revolving line of credit with the proceeds of a new $45 million term loan; refer to Note 11 for a description of the term loan.