Commitments and Contingencies - Additional Information (Details)	3 Months Ended
	Mar. 31, 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	$ 93,375
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	$ 228,225