COMMITMENTS AND CONTINGENCIES (Details 2) $ in Thousands			1 Months Ended
	Apr. 28, 2016 defendent	Sep. 23, 2009 defendent	Jun. 30, 2013 defendent	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss contingency, legal proceedings
Accrued liabilities for contingencies | $				$ 608	$ 608
SpeedTrack, Inc.
Loss contingency, legal proceedings
Number of other defendants		27
William French
Loss contingency, legal proceedings
Number of other defendants			46
State of South Dakota
Loss contingency, legal proceedings
Number of other defendants	3