Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 31, 2018
Dec. 31, 2017
Income Taxes (Textual)      
Net losses before income taxes   $ (9,803) $ (25,938)
Net losses relating to U.S. operations   $ 9,900 25,800
U.S. federal statutory income tax rate   21.00%  
Net operating loss carryforwards federal   $ 98,300  
Net operating loss carryforwards state   $ 51,000  
Net operating losses expiration date   Dec. 31, 2030  
R&D credit carryforwards federal   $ 948  
R&D credit carryforwards state   $ 500  
Federal and Texas R&D credits expire   Dec. 31, 2034  
Valuation allowance   $ 28,401 $ 25,148
U.S. corporate income tax rate, description The Tax Act significantly revised the U.S. corporate income tax regime by, among other things, lowering the corporate tax rate from 35% to 21%. The Tax Act reduced the U.S. corporate income tax rate from 35% to 21%, effective January 1, 2018. The Company re-measured its deferred tax assets and liabilities as of December 31, 2017, applying the reduced corporate income tax rate and recorded a provisional decrease to the deferred tax assets and liabilities of $12.7 million, with a corresponding adjustment to the valuation allowance.    
Description of federal net operating losses   The federal net operating losses of $85.7 million which were generated in tax years beginning before January 1, 2018, will begin to expire in 2030 if not utilized. The balance of the net operating losses, $12.6 million do not expire. The state net operating losses expire at various times depending on the state with a majority beginning to expire in 2030 if not utilized.  
Decrease to deferred tax assets and liabilities   $ 12,700