Income Taxes - Tax Credit Carryover (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Tax credit carryovers
Gross net operating loss	$ (30,823,968)	$ (34,247,060)
Federal
Tax credit carryovers
Gross net operating loss	99,989,021
California
Tax credit carryovers
Gross net operating loss	44,557,023
Research | Federal
Tax credit carryovers
Tax credit carryovers	64,047
Reduction In Credit Carry forwards		$ 1,415,339
Research | California
Tax credit carryovers
Tax credit carryovers	440,388
Reduction In Credit Carry forwards	$ 696,670