Commitments and Contingencies - Additional Information (Detail) - USD ($)		9 Months Ended	12 Months Ended
Feb. 17, 2016	Sep. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Cost of purchasing equipment or components		$ 1,800,000
Settlement paid	$ 900,000
Settlement expenses			$ 1,100,000

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

No definition available.

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