INCOME TAXES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Net income	$ 12,165	$ 5,519	$ 1,599
Cash paid for income taxes	357	$ 55	$ 272
Accounting Standards Update 2016-09
Operating Loss Carryforwards [Line Items]
Net income	800
Tax Years 2018 Through 2022
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	90,000
Tax Years 2024 Through 2025
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,500
Tax Year 2027
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	500
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	96,000
Alternative Minimum Tax Credit Carryforward | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	500
Research Tax Credit Carryforward | Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 400