Selected Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Other Current Assets [Table Text Block]

Prepaid expenses and other current assets (in thousands):

	December 31,
	2015		2014
Intrexon prepaid research and development expenses – See Note 7	$	643	$	1,067
Prepaid clinical research organization expenses		8,329		—
Prepaid insurances		339		228
Other prepaid expenses		208		253
Total	$	9,519	$	1,548

Property, Plant and Equipment [Table Text Block]

Property and equipment (in thousands):

	December 31,
	2015			2014
Computer and office equipment	$	346		$	93
Software		11			11
Leasehold improvements		242			—
		599			104
Less accumulated depreciation and amortization		(105	)		(39	)
Total	$	494		$	65

Accrued Expenses [Table Text Block]

Accrued expenses (in thousands):

	December 31,
	2015		2014
Accrued manufacturing costs	$	—	$	247
Accrued vendor payments		133		176
Accrued milestones payments		—		350
Accrued clinical consulting services		164		525
Total	$	297	$	1,298