STATEMENTS OF CASH FLOWS Table 1 (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Decrease (increase) in current assets:
Receivable from related party, net	$ (16,014)	$ 0	$ (993)	$ 1,134
Income tax receivable		198	909	(1)
Other receivables		(26)	(32)	22
Other current assets		(44)	(117)	(8)
Increase (decrease) in current liabilities:
Payable to related party		(112)	0	0
Accounts payable		2	(222)	16
Accrued compensation expense		0	(1,339)	(954)
Accrued liabilities		40	120	(97)
Taxes other than income tax		34	(1,662)	184
Changes in current assets and liabilities		$ 92	$ (3,336)	$ 296