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Income Taxes (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Income tax benefit at federal statutory rate (34.00%) (34.00%)
State income tax, net of federal benefit (6.50%) (6.40%)
Disqualified interest and other 0.90% 0.60%
Research credits (1.2)
U.S. tax reform 12.1
Valuation allowance 28.70% 39.80%
Effective tax rate