Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Property and Equipment Useful Lives

Depreciation is computed on a straight-line basis over the estimated useful life of the respective assets, which are summarized as follows:

Property and equipment category	Useful life
Computer equipment and software	3 years
Laboratory equipment	6 years
Furniture and fixtures	10 years
Leasehold improvements	Lesser of remaining lease term or life of asset

Property and equipment consisted of the following as of: 

	December 31,
($ in thousands)	2017			2016
Laboratory equipment	$	1,514		$	1,429
Computer equipment and software	318			313
Furniture and fixtures	44			44
Leasehold improvements	1,412			1,228
Construction-in-process	101			36
Total property and equipment, gross	3,389			3,050
Less: Accumulated depreciation	(1,919		)	(1,561		)
Total property and equipment, net	$	1,470		$	1,489