Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Accounts, Notes, Loans and Financing Receivable

The following table summarizes the changes in the allowance for doubtful accounts for the indicated periods:



	Balance at beginning of year		Additions / deductions charged to earnings		Uncollectible receivables written off, net of recoveries		Balance at end of year
December 31, 2015	$	17	(5	)	—		$	12
December 31, 2014	$	5	14		(2	)	$	17
December 31, 2013	$	25	(20	)	—		$	5

Property and Equipment Useful Lives

In the first quarter of 2014, the Company adjusted its useful lives to more accurately reflect the expected consumption of the economic benefit of these assets as noted in the following table:



Property and equipment category		Useful life
Laboratory equipment		6 years
Computer equipment and software		3 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:



($ in thousands)	December 31, 2015			December 31, 2014
Laboratory equipment	$	1,416		$	1,279
Computer equipment and software	296			206
Furniture and fixtures	53			49
Leasehold improvements	903			772
Construction-in-process	156			343
Total property and equipment, gross	2,824			2,649
Less: Accumulated depreciation	(1,242		)	(1,051		)
Total property and equipment, net	$	1,582		$	1,598