Commitments and Contingencies - Textual (Details) - USD ($)	Mar. 31, 2018	Dec. 30, 2017
Commitments And Contingencies Disclosure [Abstract]
Liabilities recorded for obligations	$ 0	$ 0

Intellectual property indemnification obligations.

No definition available.

Name:	nano_IntellectualPropertyIndemnificationObligations
Namespace Prefix:	nano_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant