Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 329,045	$ 644,588
Restricted cash	3,910	3,907
Short-term investments	213,190
Accounts receivable, net	158,288	116,430
Inventory	92,121	76,769
Prepaid and other current assets	20,760	13,311
Total current assets	817,314	855,005
Property, plant and equipment, net	2,466	2,361
Long-term investments	81,519
Operating lease right-of-use asset	8,397	8,511
Other long-term assets	1,074	1,074
Intangible asset, net	14,898	15,258
TOTAL ASSETS	925,668	882,209
Current Liabilities:
Accounts payable	98,330	49,950
Accrued expenses and other current liabilities	170,731	139,826
Debt from royalty-bearing instrument	36,978	50,130
Deferred revenue, current	4,288	2,342
Total current liabilities	310,327	242,248
Long-Term Liabilities:
Deferred revenue, long-term	17,519	18,504
Long-term operating lease liability	9,381	9,443
Other long-term liabilities	2,665	3,751
Total liabilities	339,892	273,946
Commitments and contingencies (Note 6)
Stockholders’ Equity:
Series A Convertible Preferred Stock, £0.05 par, unlimited authorized; 289,317,460 shares issued and outstanding as of March 31, 2020 and December 31, 2019 (equivalent to 28,931,746 ordinary shares upon future consolidation and redesignation at a 10:1 ratio)	21,850	21,850
Common stock, £0.50 par, unlimited authorized; 367,378,806 issued, 361,707,982 outstanding as of March 31, 2020; 365,014,893 issued, 360,103,901 outstanding as of December 31, 2019	270,716	269,173
Additional paid-in capital	1,774,671	1,764,317
Treasury stock; 5,670,824 shares as of March 31, 2020; 4,910,992 shares as of December 31, 2019	(49,731)	(35,900)
Accumulated deficit	(1,431,730)	(1,411,177)
Total stockholders’ equity	585,776	608,263
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 925,668	$ 882,209