Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 225,767	$ 181,381
Marketable securities	175,104	165,692
Accounts receivable, net	119,195	87,332
Inventories, net	24,418	26,628
Prepaid expenses and other current assets	12,564	11,611
Total current assets	557,048	472,644
Long term marketable securities	534,712	591,773
Property and equipment, net	18,011	17,068
Intangible assets, net	23,579	24,840
Lease assets	21,911	21,279
Deferred income taxes	34,067	32,063
Other assets	538	615
Total assets	1,189,866	1,160,282
Current liabilities
Accounts payable	3,124	10,141
Accrued product returns and rebates	119,453	107,629
Accrued expenses and other current liabilities	33,003	37,130
Income taxes payable	9,097	2,443
Nonrecourse liability related to sale of future royalties, current portion	3,658	3,244
Total current liabilities	168,335	160,587
Convertible notes, net	349,232	345,170
Nonrecourse liability related to sale of future royalties, long term	18,369	19,248
Lease liabilities, long term	30,804	30,440
Other liabilities	9,743	9,409
Total liabilities	576,483	564,854
Stockholders’ equity
Common stock, $0.001 par value; 130,000,000 shares authorized; 52,537,159 and 52,533,348 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	53	53
Additional paid-in capital	392,430	388,410
Accumulated other comprehensive earnings (loss), net of tax	(166)	7,417
Retained earnings	221,066	199,548
Total stockholders’ equity	613,383	595,428
Total liabilities and stockholders’ equity	$ 1,189,866	$ 1,160,282