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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: |