Income Taxes (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | |
---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 10,827 | $ 7,983 |
Federal | ||
Operating Loss Carryforwards | $ 93,749 | |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2027 | |
Federal | Employee Stock Option [Member] | ||
Deferred Tax Assets, Net of Valuation Allowance, Total | $ 1,684 | |
Federal | Research Tax Credit Carryforward [Member] | ||
Operating Loss Carryforwards | 818 | |
State | ||
Operating Loss Carryforwards | $ 76,263 | |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2017 | |
State | Employee Stock Option [Member] | ||
Deferred Tax Assets, Net of Valuation Allowance, Total | $ 657 | |
Open Tax Year | 2007 | |
State | Research Tax Credit Carryforward [Member] | ||
Operating Loss Carryforwards | $ 524 | |
Foreign Tax Authority [Member] | ||
Operating Loss Carryforwards | $ 2,012 |