CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 253,256	$ 162,855
Marketable securities	140,915	136,593
Accounts receivable, net	75,347	91,460
Inventories	26,691	34,443
Prepaid and other current assets	18,961	11,009
Note receivable	10,000	0
Assets held for sale	0	45,508
Total current assets	525,170	481,868
Property and equipment, net	7,521	7,904
Goodwill	422,513	422,513
Intangible assets, net	217,033	375,479
Deferred tax assets	1,260	47,120
Restricted cash	495	495
Other long-term assets	1,467	266
Assets held for sale, net of current portion	0	564,711
Total assets	1,175,459	1,900,356
Current liabilities:
Accounts payable	14,487	7,717
Accrued expenses	129,537	166,732
Current portion of convertible notes, net	21,276	0
Current portion of acquisition-related contingent consideration	144	49,399
Liabilities held for sale	0	53,870
Total current liabilities	165,444	277,718
Long-term liabilities:
Long-term debt, net	0	466,291
Convertible notes, net	261,933	268,392
Acquisition-related contingent consideration	215	686
Other long-term liabilities	1,212	1,204
Liabilities held for sale, net of current portion	0	95,821
Total liabilities	428,804	1,110,112
Commitments and Contingencies (Note P)
Stockholders’ equity:
Preferred stock, par value $0.01 per share, 2,000,000 shares authorized; none issued	0	0
Common stock, par value $0.01 per share, 117,500,000 shares authorized; 34,606,760 and 34,083,112 shares issued and outstanding at December 31, 2018 and December 31, 2017, respectively	346	341
Additional paid-in capital	1,292,736	1,271,628
Accumulated other comprehensive loss	(3,985)	(3,908)
Accumulated deficit	(542,442)	(477,817)
Total stockholders’ equity	746,655	790,244
Total liabilities and stockholders’ equity	$ 1,175,459	$ 1,900,356