Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 11,626	$ 17,306	[1]
Marketable securities	23,261	8,578	[1]
Receivables	1,008	129	[1]
Inventory	4,414	3,447	[1]
Prepaid expenses and other current assets	3,039	1,453	[1]
Total current assets	43,348	30,913	[1]
Property and equipment, net	15,017	14,991	[1]
Restricted cash	4,160	0	[1]
Other assets	3,272	1,168	[1]
Total assets	65,797	47,072	[1]
Current liabilities:
Accounts payable	1,692	3,789	[1]
Accrued clinical trial expenses	557	178	[1]
Other accrued expenses	4,769	4,736	[1]
Current portion of contingent consideration liability	1,400	2,500	[1]
Current portion of financing obligations	201	780	[1]
Current portion of deferred revenue	2,374	2,915	[1]
Total current liabilities	10,993	14,898	[1]
Deferred rent	5,150	6,405	[1]
Noncurrent portion of contingent consideration liability	32,200	36,700	[1]
Noncurrent portion of deferred revenues	2,186	2,185	[1]
Noncurrent portion of financing obligations	63,378	10,744	[1]
Other noncurrent liabilities	729	115	[1]
Stockholders' deficit:
Preferred stock	0	0	[1]
Common stock	2	2	[1]
Additional paid-in-capital	355,413	350,250	[1]
Accumulated other comprehensive income	(1)	1	[1]
Accumulated deficit	(404,253)	(374,228)	[1]
Total stockholders' deficit	(48,839)	(23,975)	[1]
Total liabilities and stockholders' equity	$ 65,797	$ 47,072	[1]

[1] The condensed consolidated balance sheet at December 31, 2013 has been derived from audited consolidated financial statements at that date.