Selected Balance Sheet Information (Tables)

6 Months Ended

Jun. 30, 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)

	June 30, 2016		December 31, 2015
Intrexon prepaid research and development expenses	$	48	$	643
Prepaid clinical research organizations		4,823		8,329
Prepaid insurances		185		339
Other prepaid expenses		718		208
Total	$	5,774	$	9,519

Property, Plant and Equipment [Table Text Block]

Property and equipment (in thousands)  

	June 30, 2016		December 31, 2015
Computer and office equipment	$	384	$	346
Software		11		11
Leasehold improvements		241		242
		636		599
Less accumulated depreciation and amortization		(154)		(105)
Total	$	482	$	494

Accrued Expenses [Table Text Block]

Accrued expenses (in thousands)

	June 30, 2016		December 31, 2015
Accrued manufacturing costs	$	203	$	-
Accrued vendor payments		486		133
Accrued clinical consulting services		1,152		164
Total	$	1,841	$	297

Accrued Employee Benefits [Table Text Block]

Accrued employee benefits (in thousands)

	June 30, 2016		December 31, 2015
Accrued bonus expense	$	717	$	-
Accrued vacation expense		199		153
Other accrued employee benefits		258		124
Total	$	1,174	$	277