Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 211,089	$ 249,227
Restricted cash	1,502	1,500
Accounts receivable, net	79,485	66,523
Inventory	57,909	57,802
Prepaid and other current assets	5,334	2,945
Total current assets	355,319	377,997
Property, plant and equipment, net	57	63
Operating lease right-of-use asset	8,900
Other long-term assets	643	174
Intangible asset, net	7,319	7,480
TOTAL ASSETS	372,238	385,714
Current Liabilities:
Accounts payable	26,776	37,632
Accrued expenses and other current liabilities	94,170	84,171
Current portion of long-term debt from royalty-bearing instrument	38,960	34,240
Deferred revenue, current	1,898	1,220
Total current liabilities	161,804	157,263
Long-Term Liabilities:
Long-term debt from royalty-bearing instrument	35,338	46,108
Deferred revenue, long-term	18,265	19,490
Long-term operating lease liability	7,930
Other long-term liabilities	8,030	10,523
Total liabilities	231,367	233,384
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, 2019 and December 31, 2018 (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; 334,365,726 issued, 330,578,168 outstanding as of March 31, 2019; 329,110,863 issued, 325,850,013 outstanding as of December 31, 2018	250,088	246,663
Additional paid-in capital	1,301,389	1,282,762
Treasury stock; 3,787,558 shares as of March 31, 2019; 3,260,850 shares as of December 31, 2018	(19,493)	(10,413)
Accumulated deficit	(1,412,963)	(1,388,532)
Total stockholders’ equity	140,871	152,330
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 372,238	$ 385,714