CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 287,166	$ 162,855
Marketable securities	140,368	136,593
Accounts receivable, net	85,091	91,460
Inventories	27,953	34,443
Prepaid and other current assets	13,182	11,009
Assets held for sale	0	45,508
Total current assets	553,760	481,868
Property and equipment, net	7,047	7,904
Goodwill	422,513	422,513
Intangible assets, net	230,747	375,479
Deferred tax assets	1,185	47,120
Restricted cash	495	495
Other long-term assets	69	266
Assets held for sale, net of current portion	0	564,711
Total assets	1,215,816	1,900,356
Current liabilities:
Accounts payable	30,331	7,717
Accrued expenses	141,753	166,732
Current portion of convertible notes, net	20,999	0
Current portion of acquisition-related contingent consideration	208	49,399
Liabilities held for sale	0	53,870
Total current liabilities	193,291	277,718
Long-term liabilities:
Long-term debt, net	0	466,291
Convertible notes, net	258,376	268,392
Acquisition-related contingent consideration	615	686
Other long-term liabilities	1,288	1,204
Liabilities held for sale, net of current portion	0	95,821
Total liabilities	453,570	1,110,112
Commitments and contingencies
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; 34,522,957 and 34,083,112 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	345	341
Additional paid-in capital	1,286,227	1,271,628
Accumulated other comprehensive loss	(4,161)	(3,908)
Accumulated deficit	(520,165)	(477,817)
Total stockholders’ equity	762,246	790,244
Total liabilities and stockholders’ equity	$ 1,215,816	$ 1,900,356