Balance Sheet Components - Property and Equipment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property and Equipment
Property, Plant and Equipment, Gross	$ 938,594		$ 938,594		$ 938,594
Accumulated depreciation	(82,711)		(82,711)		(52,649)
Property and Equipment, net	855,883		855,883		885,945
Depreciation and amortization expense	15,031	$ 9,554	30,062	$ 17,432
Lab equipment
Property and Equipment
Property, Plant and Equipment, Gross	811,087		811,087		811,087
Lab equipment | Research and development expense
Property and Equipment
Depreciation and amortization expense	6,568	6,568	13,136	13,136
Clinical equipment
Property and Equipment
Property, Plant and Equipment, Gross	64,870		64,870		64,870
Clinical equipment | Research and development expense
Property and Equipment
Depreciation and amortization expense	3,244	2,551	6,487	3,716
Software
Property and Equipment
Property, Plant and Equipment, Gross	62,637		62,637		$ 62,637
Software | General and administrative expense
Property and Equipment
Depreciation and amortization expense	$ 5,219	$ 435	$ 10,439	$ 580