INCOME TAXES - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Deferred charges	$ 1,553	$ 1,316
Stock compensation expense	237	98
Other accruals	4,421	2,427
Research and development credits	160	2,406
Capital lease obligation	134	134
Foreign tax credit and AMT credit carry forwards	2,087	13,188
Financing costs	453	1,974
Unrealized loss on foreign currency transactions	700	914
Net operating loss carry forwards	15,668	14,093
Total deferred tax assets	25,413	36,550
Less: valuation allowance	(16,890)	(26,137)
Total deferred tax assets, net	8,523	10,413
Deferred tax liabilities:
Property and equipment	(3,061)	(6,372)
Intangible assets	(340)	(340)
Total deferred tax liabilities	(3,401)	(6,712)
Net deferred tax asset	$ 5,122	$ 3,701