Selected Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Other Current Assets [Table Text Block]

 Prepaid expenses and other current assets (in thousands)

	March 31, 2016		December 31, 2015
Intrexon prepaid research and development expenses	$	307	$	643
Prepaid clinical research organizations		6,160		8,329
Prepaid insurances		224		339
Other prepaid expenses		425		208
Total	$	7,116	$	9,519

Property, Plant and Equipment [Table Text Block]

Property and equipment (in thousands)

	March 31, 2016		December 31, 2015
Computer and office equipment	$	371	$	346
Software		11		11
Leasehold improvements		242		242
		624		599
Less accumulated depreciation and amortization		(123)		(105)
Total	$	501	$	494

Accrued Expenses [Table Text Block]

Accrued expenses (in thousands)

	March 31, 2016		December 31, 2015
Accrued manufacturing costs	$	2	$	-
Accrued vendor payments		388		133
Accrued clinical consulting services		556		164
Total	$	946	$	297

Accrued Employee Benefits [Table Text Block]

Accrued employee benefits (in thousands)

	March 31, 2016		December 31, 2015
Accrued bonus expense	$	355	$	-
Accrued vacation expense		248		153
Other accrued employee benefits		266		124
Total	$	869	$	277