Income Taxes (Details Textual) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Dec. 31, 2016
Income tax expense		$ 88	$ (223)
State tax net of federal benefit		(4.90%)	(4.10%)
Valuation allowance		$ (65,817)	$ (72,199)
Deferred tax assets		10,300
Amount of unrecognized or expected tax benefits recorded in financial statement		1,141	1,141
Current income tax provision		88	331
Income tax holiday		$ 42
Investment tax credits and research and development credits scheduled to expire		2018
Increase (decrease) in foreign with holding taxes payable		$ 129	274
Deferred tax assets and liabilities		10,300
Untaxed earnings overseas		$ 3,900
Malaysia [Member]
Current income tax provision			$ 42
Number of period for which income tax is exempted		5 years
Tax holiday additional renewal period		5 years
Research and development credits [Member]
Tax credit carry forward amount		$ 66
Investment credit [Member]
Tax credit carry forward amount		95
Federal [Member]
Deferred tax assets		26,400
Net operating loss carryforward		177,900
Liability for uncertain tax positions		2,600
Tax credit carry forward amount		$ 805
Operating loss carry forwards expiration year		2021
Deferred tax assets and liabilities		$ 28,000
State and local jurisdiction [Member]
Net operating loss carryforward		$ 212,000
Operating loss carry forwards expiration year		2019
Maximum [Member]
U.S. corporate tax rate	35.00%
Minimum [Member]
U.S. corporate tax rate	21.00%