CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 157,031	$ 158,883	[1]
Accounts receivable, net	16,305	14,366	[1]
Inventories	3,722	2,784	[1]
Prepaid expenses and other receivables	1,336	1,185	[1]
Total current assets	178,394	177,218	[1]
Property, plant and equipment, net	3,355	3,262	[1]
Product acquisition costs, net	12,074	10,604	[1]
Debt issuance costs, net	4,946	5,132	[1]
Other	834	862	[1]
Total assets	199,603	197,078	[1]
Current liabilities:
Accounts payable	2,551	1,643	[1]
Accrued expenses	6,591	5,141	[1]
Payable for product acquisition costs	6,000	6,000	[1]
Deferred income, current	27	87	[1]
Capital lease obligation, current	129	131	[1]
Total current liabilities	15,298	13,002	[1]
Convertible 3.75% senior notes, net of debt discount (face of $143,750)	101,901	100,311	[1]
Fair value of derivative liability - convertible 3.75% senior notes	32,775	41,400	[1]
Note payable, bank	3,160	3,160	[1]
Other long term liabilities	40	71	[1]
Total liabilities	153,174	157,944	[1]
Stockholders’ equity:
Common stock, $0.01 par value, 60,000,000 shares authorized; 52,859,953 and 52,819,787 shares issued and outstanding as of March 31, 2015 and December 31, 2014, respectively	548	548	[1]
Additional paid-in capital	78,912	78,172	[1]
Accumulated deficit	(33,031)	(39,586)	[1]
Total stockholders' equity	46,429	39,134	[1]
Total liabilities and stockholders' equity	199,603	197,078	[1]
Series A Preferred Stock [Member]
Stockholders’ equity:
Convertible Preferred stock	0	0	[1]
Series C Preferred Stock [Member]
Stockholders’ equity:
Convertible Preferred stock	$ 0	$ 0	[1]

[1] *Derived from the audited December 31, 2014 financial statements