Commitments and Contingencies - Additional Information (Details)	6 Months Ended
	Jun. 30, 2017 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.
Lease equipment financing arrangement	$ 13,000
Lease expiration date of lease payments not in schedule	2017-12
Computer Equipment
Commitments And Contingencies [Line Items]
Capital lease commitments	$ 115,000
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