Commitments and Contingencies - Additional Information (Detail) (USD $)	Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Operating lease expiration period	2017
Liabilities recorded for indemnification provisions	$ 0

Liabilities recorded for indemnification provisions.

No definition available.

Name:	emis_LiabilitiesRecordedForIndemnificationProvisions
Namespace Prefix:	emis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant