REVOLVING CREDIT FACLITY - Narrative (Details)	Mar. 30, 2015	Oct. 21, 2014 USD ($) Quarter	Oct. 20, 2014 USD ($)	Apr. 12, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Debt issuance costs				$ 400,000
Revolving credit facility
Line of Credit Facility [Line Items]
Revolving credit facility, term				3 years
Revolving credit facility, maximum borrowing capacity				$ 25,000,000
Effective interest rate					3.50%
Percentage monthly commitment fee on unused portion of credit facility				0.375%
Revolving credit facility, amount outstanding					$ 0	$ 0
Revolving credit facility | Alternative base rate | Federal funds effective rate
Line of Credit Facility [Line Items]
Variable rate				0.50%
Revolving credit facility | Alternative base rate | Prime rate
Line of Credit Facility [Line Items]
Interest rate increase in an event of default				2.00%
Revolving credit facility | Eurodollar rate
Line of Credit Facility [Line Items]
Denominator of applicable margin				1
Revolving credit facility | Amended agreement No. 4
Line of Credit Facility [Line Items]
Revolving credit facility, one time additional borrowing		$ 25,000,000
Revolving credit facility, minimum EBITDA		$ 2,000,000	$ 6,000,000
Number of consecutive quarters immediately prior to end of reporting period to determine minimum EBITDA | Quarter		2
Minimum quick ratio	1.25	1.00
Covenant, minimum available funds		$ 30,000,000
Credit agreement, borrowing base components, percentage of eligible accounts receivable and advance billings		85.00%
Credit agreement, borrowing base components, percentage of eligible inventory minus reserves		50.00%
Commitment fee				$ 62,500
Revolving credit facility | Amended agreement No. 4 | Alternative base rate
Line of Credit Facility [Line Items]
Variable rate		0.00%
Revolving credit facility | Amended agreement No. 4 | Eurodollar rate
Line of Credit Facility [Line Items]
Variable rate		2.75%