Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 86,987	$ 82,609
Investments in marketable securities	3,772	44,618
Restricted cash	450	450
Accounts receivable, net	4,968	2,703
Inventory	4,328	1,388
Prepaid expenses	1,035	1,071
Other current assets	50	90
Total current assets	101,590	132,929
Property and equipment, net	10,296	10,569
Intangible assets, net	12,761	13,433
Restricted cash	190	190
Other assets	7,027	7,039
Total assets	131,864	164,160
Current liabilities:
Accounts payable	8,212	3,801
Accrued liabilities	12,071	10,945
Deferred revenue	1,677	1,291
Current debt, less discount of $184 and $ , respectively	5,179
Total current liabilities	27,139	16,037
Long-term debt, less current portion and discount of $848 and $1,304, respectively	23,789	28,696
Other liabilities	442	117
Total liabilities	51,370	44,850
Commitments and contingencies (Note 11)
Stockholders' equity:
Common stock, $0.0001 par value; 200,000,000 shares authorized and 85,559,556 shares issued and outstanding at June 30, 2012 and 100,000,000 shares authorized and 85,511,607 shares issued and outstanding at December 31, 2011	9	9
Additional paid-in capital	490,830	485,982
Accumulated other comprehensive income		2
Accumulated deficit	(410,345)	(366,683)
Total stockholders' equity	80,494	119,310
Total liabilities and stockholders' equity	$ 131,864	$ 164,160