Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 290,994	$ 186,964
Restricted cash	3,917	3,915
Short-term investments	223,742	313,969
Accounts receivable, net	151,275	154,574
Inventory	230,892	188,864
Prepaid and other current assets	29,696	30,947
Total current assets	930,516	879,233
Property, plant and equipment, net	1,862	2,016
Long-term investments	24,004	62,469
Operating lease right-of-use asset	7,958	8,054
Other long-term assets	456	432
Intangible asset, net	25,456	13,817
TOTAL ASSETS	990,252	966,021
Current Liabilities:
Accounts payable	94,262	105,876
Accrued expenses and other current liabilities	228,734	198,641
Current deferred revenue	2,773	2,926
Total current liabilities	325,769	307,443
Long-Term Liabilities:
Long-term deferred revenue	15,197	15,706
Long-term operating lease liability	9,015	9,153
Other long-term liabilities	5,660	6,214
Total liabilities	355,641	338,516
Commitments and contingencies (Note 5)
Stockholders’ Equity:
Common stock, £0.50 par, unlimited authorized; 401,655,725 shares issued, 394,764,841 shares outstanding as of March 31, 2021; 398,425,000 shares issued, 392,538,081 shares outstanding as of December 31, 2020	292,360	290,115
Additional paid-in capital	1,831,388	1,817,649
Treasury stock; 6,890,884 shares as of March 31, 2021; 5,886,919 shares as of December 31, 2020	(58,334)	(51,082)
Accumulated deficit	(1,430,803)	(1,429,177)
Total stockholders’ equity	634,611	627,505
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 990,252	$ 966,021