Commitments - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Contractual Obligation [Line Items]
Capital lease obligation amount		$ 3,240,000	$ 4,907,000
Laboratory and Computer Equipment [Member]
Contractual Obligation [Line Items]
Capital lease obligation amount	$ 683,000	$ 3,200,000
Lease term period		36 months
Buyout option	1.00	$ 1.00
Laboratory [Member]
Contractual Obligation [Line Items]
Lease term period		36 months
Buyout option	1.00	$ 1.00
Construction contract, amount	$ 5,000,000	$ 5,000,000
Minimum [Member] | Laboratory and Computer Equipment [Member]
Contractual Obligation [Line Items]
Interest rate	0.00%	0.00%
Maximum [Member] | Laboratory and Computer Equipment [Member]
Contractual Obligation [Line Items]
Interest rate	19.50%	19.50%