Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 7,755	$ 15,200
Marketable securities	0	19,574
Receivables	0	173
Inventory, net	0	3,729
Prepaid expenses and other current assets	3,237	3,109
Total current assets	10,992	41,785
Property and equipment, net	3,320	13,953
Restricted cash	0	2,757
Other assets	419	3,065
Total assets	14,731	61,560
Current liabilities:
Accounts payable	442	1,799
Accrued clinical trial liabilities	178	875
Other accrued liabilities	6,990	4,693
Current portion of contingent consideration liability	900	1,700
Financing obligations	46,840	0
Current portion of deferred revenues	2,848	2,450
Total current liabilities	58,198	11,517
Deferred rent	3,412	4,781
Noncurrent portion of contingent consideration liability	1,900	29,100
Noncurrent portion of deferred revenues	0	3,063
Noncurrent portion of financing obligations	21,127	63,767
Other noncurrent liabilities	$ 1,752	$ 985
Commitments and contingencies
Stockholders’ (deficit):
Preferred stock, $0.0001 par value, 5,000,000 shares authorized at December 31, 2015 and 2014; no shares issued and outstanding at December 31, 2015 or 2014	$ 0	$ 0
Common stock, $0.0001 par value; 200,000,000 shares authorized at December 31, 2015 and 2014, respectively; 19,577,729 and 19,404,697 shares issued and outstanding at December 31, 2015 and 2014, respectively	2	2
Additional paid-in capital	360,610	359,308
Accumulated other comprehensive (loss) income	0	(3)
Accumulated deficit	(432,270)	(410,960)
Total stockholders’ deficit	(71,658)	(51,653)
Total liabilities and stockholders’ deficit	$ 14,731	$ 61,560