XML 21 R9.htm IDEA: XBRL DOCUMENT v3.3.0.814

Condensed Consolidated Statements of Cash Flows (Parenthetical) (Unaudited)	9 Months Ended
	Sep. 30, 2015 $ / shares
Minimum
Change in par value	$ 0.001
Maximum
Change in par value	$ 0.0001

X

- Definition

Change in par value.

+ References

No definition available.

+ Details

Name:	nk_ChangeInParValue
Namespace Prefix:	nk_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: