INCOME TAXES - TEMPORARY DIFFERENCES TO THE COMPONENTS OF DEFERRED TAX ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Inventory	$ 1,172	$ 954
Accrued compensation	114	267
Stock and Stock Options	811	344
Research and development tax credit	438	440
Alternative minimum tax credit	543	367
Deferred revenue	2,934	3,638
Property and equipment	2,750	1,967
Net operating loss carryforwards – domestic	34,706	37,845
Capital Lease	(2,833)	(384)
Other	34	(8)
Deferred tax assets, gross	40,669	45,430
Valuation allowance	(19,547)	(19,547)
Total net deferred tax assets	$ 21,122	$ 25,883