Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	[1]
Current assets:
Cash and cash equivalents	$ 12,193	$ 15,200
Marketable securities	3,503	19,574
Receivables	303	173
Inventory	1,407	3,729
Prepaid expenses and other current assets	1,565	3,109
Total current assets	18,971	41,785
Property and equipment, net	11,014	13,953
Restricted cash	0	2,757
Other assets	2,648	3,065
Total assets	32,633	61,560
Current liabilities:
Accounts payable	2,618	1,799
Accrued clinical trial expenses	689	875
Other accrued expenses	2,831	4,693
Current portion of contingent consideration liability	900	1,700
Current portion of deferred revenue	2,970	2,450
Total current liabilities	10,008	11,517
Deferred rent	4,106	4,781
Noncurrent portion of contingent consideration liability	15,000	29,100
Noncurrent portion of deferred revenues	1,424	3,063
Noncurrent portion of financing obligations	64,530	63,767
Other noncurrent liabilities	1,475	985
Stockholders' deficit:
Preferred stock	0	0
Common stock	2	2
Additional paid-in-capital	359,902	359,308
Accumulated other comprehensive loss	0	(3)
Accumulated deficit	(423,814)	(410,960)
Total stockholders' deficit	(63,910)	(51,653)
Total liabilities and stockholders' deficit	$ 32,633	$ 61,560

[1] (1) The condensed consolidated balance sheet at December 31, 2014 has been derived from audited consolidated financial statements at that date.