Note 9 – Other Financial Information

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following at December 31 (in thousands):

	2014		2013
Laboratory supplies	$	7,564	$	1,754
Other prepaid expenses and other current assets		1,631		1,863
Prepaid expenses and other current assets	$	9,195	$	3,617

Property and Equipment, net

Property and equipment is comprised of the following at December 31 (in thousands):

	2014		2013
Machinery and equipment	$	16,712	$	11,951
Leasehold improvements		8,843		8,192
Computer software and hardware		1,733		1,200
Construction in progress		3,719		2,328
		31,007		23,671
Less — accumulated depreciation and amortization		(11,270)		(9,420)
Property and equipment, net	$	19,737	$	14,251

Depreciation and amortization expense was approximately $4.4 million, $2.6 million and $1.7 million for the years ended December 31, 2014, 2013 and 2012, respectively. Machinery and equipment included $0.4 million and $0.6 million of equipment acquired under a capital leases with accumulated depreciation of $0.2 million as of December 31, 2014 and 2013, respectively.

Accrued Expenses

Accrued expenses consist of the following at December 31 (in thousands):

	2014		2013
Employee benefits and compensation	$	8,597	$	5,323
Research and development accruals		9,826		3,657
Other accrued expenses		974		1,431
Accrued expenses	$	19,397	$	10,411