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Income Taxes (Details Narrative)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Effective federal statutory rate 34.00%
Gross tax-effected unrealized net operating loss carryforwards $ 1,200
Federal [Member]  
Net operating loss carryforwards $ 142,300
Net operating loss carryforwards expired

2023 through 2036
Research and development tax credit carryforwards $ 3,242
Research and development tax credit carryforwards expired

2023 through 2036
State [Member]  
Net operating loss carryforwards $ 938,000
Net operating loss carryforwards expired

2016 through 2036
Research and development tax credit carryforwards $ 3,410