Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Lease expiration date	Jun. 30, 2019
Area of facility lease \| ft²	5,275
Rent expense \| $	$ 208,000	$ 210,000

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration