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Income Taxes - Reconciliation of Total Income Tax Provision (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of the total income tax provision tax rate [Abstract]    
Income tax expense (benefit) at federal statutory rate (34.00%) (34.00%)
Income tax expense (benefit) at state statutory rate (3.41%) (4.40%)
Mark to market permanent adjustment 0.00% (13.91%)
Change in valuation allowance 16.75% (7.45%)
Change in state rate (0.06%) (0.09%)
Permanent interest adjustments 0.16% 6.25%
Stock compensation 12.67% 20.43%
Transfer pricing 0.00% 18.49%
Research credit (1.44%) (2.37%)
Foreign rate differential 0.79% 0.69%
NOLs expiring and adjustments to NOL 6.00% 13.92%
Other, net 2.54% 2.44%
Total income tax provision 0.00% 0.00%