Summary of Significant Accounting Policies - (Tables)

12 Months Ended

Dec. 31, 2018

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)	2018			2017
Laboratory equipment	$	1,562		$	1,514
Computer equipment and software	319			318
Furniture and fixtures	44			44
Leasehold improvements	1,449			1,412
Construction-in-process	159			101
Total property and equipment, gross	3,533			3,389
Less: Accumulated depreciation	(2,311		)	(1,919		)
Total property and equipment, net	$	1,222		$	1,470