Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 122,778	$ 192,248
Marketable securities	170,165	163,770
Accounts receivable, net	79,950	102,922
Inventories, net	26,518	25,659
Prepaid expenses and other current assets	20,556	8,888
Total current assets	419,967	493,487
Long term marketable securities	522,551	418,798
Property and equipment, net	4,226	4,095
Intangible assets, net	30,063	31,368
Lease assets	20,049
Deferred income taxes	27,967	29,683
Other assets	625	380
Total assets	1,025,448	977,811
Current liabilities
Accounts payable	7,240	3,195
Accrued product returns and rebates	88,200	107,063
Accrued expenses and other current liabilities	36,607	36,535
Income taxes payable	17,233	12,377
Non-recourse liability related to sale of future royalties, current portion	2,426	2,183
Total current liabilities	151,706	161,353
Convertible notes, net	333,310	329,462
Non-recourse liability related to sale of future royalties, long term	21,957	22,575
Lease liabilities, long term	27,824
Other non-current liabilities	10,633	11,398
Total liabilities	545,430	524,788
Stockholders' equity
Common stock, $0.001 par value, 130,000,000 shares authorized 52,374,248 and 52,316,583 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	52	52
Additional paid-in capital	373,707	369,637
Accumulated other comprehensive earnings (loss), net of tax	1,427	(3,158)
Retained earnings	104,832	86,492
Total stockholders' equity	480,018	453,023
Total liabilities and stockholders' equity	$ 1,025,448	$ 977,811