Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 33,907	$ 40,302
Marketable securities	68,725	48,206
Accounts receivable, net	537
Interest receivable	791	664
Inventories	4,315	1,152
Prepaid expenses and other	1,912	994
Deferred financing costs, current	430	144
Total current assets	110,617	91,462
Property and equipment, net	2,247	1,421
Purchased patents, net	568	683
Long term investments	16,072
Other assets	360	334
Deferred financing costs, long-term	2,109	89
Total assets	131,973	93,989
Current liabilities:
Accounts payable and accrued expenses	11,732	10,666
Deferred product revenue, net	3,967
Deferred licensing revenue	325	508
Secured notes payable, net of discount		11,809
Total current liabilities	16,024	22,983
Deferred licensing revenue, net of current portion	738	309
Convertible notes, net of discount	59,100
Secured notes payable, net of current portion and discount		11,088
Other non-current liabilities	2,158	1,788
Derivative liabilities	18,061	251
Total liabilities	96,081	36,419
Stockholders' equity:
Common stock, $0.001 par value - 130,000,000 shares authorized at June 301, 2013 and December 31, 2012; 30,XXX,XXX and 30,621,869 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	31	31
Additional paid-in capital	168,122	143,851
Accumulated other comprehensive loss	(235)	(57)
Accumulated deficit	(132,026)	(86,255)
Total stockholders' equity	35,892	57,570
Total liabilities and stockholders' equity	$ 131,973	$ 93,989