Commitments and Contingencies - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Commitments And Contingencies [Line Items]
Lease expiration term		The Company leases office and laboratory space in Tucson, Arizona under two non-cancelable operating leases.
Computer Equipment
Commitments And Contingencies [Line Items]
Capital lease commitments	$ 88,700	$ 88,700
Computer Equipment | Minimum
Commitments And Contingencies [Line Items]
Capital lease commitment period		36 months
Computer Equipment | Maximum
Commitments And Contingencies [Line Items]
Capital lease commitment period		48 months
Non-Executive Officer Employees
Commitments And Contingencies [Line Items]
Compensation expenses	$ 244,588	$ 472,813