Commitments - Additional Information (Detail) - USD ($)	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Contractual Obligation [Line Items]
Agreement for purchase of equipment	$ 173,000	$ 2,525,000
Laboratory and Computer Equipment [Member]
Contractual Obligation [Line Items]
Agreement for purchase of equipment	$ 173,000
Interest rate	5.00%
Laboratory and Computer Equipment [Member] \| 36 Month Term [Member]
Contractual Obligation [Line Items]
Lease term period	36 months
Buyout option	$ 1.00
Interest rate	6.01%

The increase during the period in capital lease obligations due to entering into new capital leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Name:	us-gaap_CapitalLeaseObligationsIncurred
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration