Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 42,205	$ 72,021
Restricted cash	8,500	0
Trade accounts receivable, net	8,877	6,665
Inventory	13,439	9,936
Prepaid expenses	2,224	2,144
Other current assets	2,733	2,113
Total current assets	77,978	92,879
Property and equipment, net	10,618	13,011
Intangible assets	102,500	0
Goodwill	6,234	0
Other assets	5,505	6,614
Total assets	202,835	112,504
Current liabilities:
Accounts payable	8,523	4,622
Accrued expenses	15,486	18,865
Common stock warrant liabilities	5,093	31,341
Accrued compensation	5,090	3,952
Revolving credit facility	1,450	0
Deferred revenue	8,595	0
Total current liabilities	44,237	58,780
Long-term debt	21,703	28,802
Deferred revenue, less current portion	7,063	0
Contingent purchase consideration	53,000	0
Deferred tax liability	20,500	0
Other long-term liabilities	1,053	6,496
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value; 200,000 shares authorized at December 31, 2014 and 2013; 153,363 and 138,927 shares issued and outstanding at December 31, 2014 and 2013, respectively.	153	139
Additional paid-in capital	456,786	428,534
Accumulated deficit	(401,660)	(410,247)
Total stockholders’ equity	55,279	18,426
Total liabilities and stockholders’ equity	$ 202,835	$ 112,504