CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 137,917	$ 253,256
Marketable securities	128,593	140,915
Accounts receivable, net	83,334	75,347
Inventories	29,664	26,691
Prepaid and other current assets	40,567	18,961
Note receivable	0	10,000
Total current assets	420,075	525,170
Property and equipment, net	8,995	7,521
Goodwill	422,513	422,513
Intangible assets, net	213,090	217,033
Operating lease right-of-use asset	7,024
Deferred tax assets	630	1,260
Restricted cash	495	495
Other long-term assets	29	1,467
Total assets	1,072,851	1,175,459
Current liabilities:
Accounts payable	21,535	14,487
Accrued expenses	155,687	129,537
Current portion of convertible notes, net	0	21,276
Current portion of operating lease liability	3,529
Current portion of deferred revenue	2,112	0
Current portion of acquisition-related contingent consideration	118	144
Total current liabilities	182,981	165,444
Long-term liabilities:
Convertible notes, net	265,576	261,933
Long-term operating lease liability	4,328
Long-term deferred revenue	4,288	0
Long-term acquisition-related contingent consideration	218	215
Other long-term liabilities	741	1,212
Total liabilities	458,132	428,804
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; 33,746,828 and 34,606,760 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	337	346
Additional paid-in capital	1,282,284	1,292,736
Accumulated other comprehensive loss	(3,376)	(3,985)
Accumulated deficit	(664,526)	(542,442)
Total stockholders’ equity	614,719	746,655
Total liabilities and stockholders’ equity	$ 1,072,851	$ 1,175,459