COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands		12 Months Ended
	Mar. 12, 2015 $ / violation	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Increase in royalties payable		$ 300	$ 400	$ 400
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018		2,156
2019		2,035
2020		1,835
2021		1,747
2022		1,714
Thereafter		1,617
Total operating lease, future minimum payments		11,104
Rent expense		1,600	1,600	$ 1,600
Loss Contingencies [Line Items]
Warranty reserve		$ 200	$ 400
Minimum | Illinois Junk Fax Litigation
Loss Contingencies [Line Items]
Estimate of possible loss, charge per violation | $ / violation	500