Quarterly report pursuant to Section 13 or 15(d)

Sponsored Research and Clinical Trial Agreements - summary of Helocyte???s expense related to its clinical research arrangements (Detail)

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Sponsored Research and Clinical Trial Agreements - summary of Helocyte’s expense related to its clinical research arrangements (Detail) - Helocyte Inc [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Payments For Research And Development Expenses $ 204 $ 547 $ 204 $ 1,282
COH Triplex Clinical Research and Support [Member]        
Payments For Research And Development Expenses 0 535 0 1,035
COH PepVax Clinical Research And Support [Member]        
Payments For Research And Development Expenses 0 0 0 235
COH Pentamer clinical research and support [Member]        
Payments For Research And Development Expenses $ 204 $ 12 $ 204 $ 12