Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 129,049	$ 73,637
Restricted cash	600	600
Accounts receivable, net	39,180	45,318
Inventory, net	35,104	30,260
Prepaid and other current assets	3,618	3,455
Total current assets	207,551	153,270
Property, plant and equipment, net	20	28
Other long-term assets	174	174
Intangible asset, net	7,964	8,126
TOTAL ASSETS	215,709	161,598
Current Liabilities:
Accounts payable	31,877	25,155
Accrued expenses and other current liabilities	61,311	58,902
Current portion of exchangeable senior notes, net of discount	219	481
Current portion of long-term debt from royalty-bearing instrument	24,370	22,348
Deferred revenue, current	1,453	1,644
Total current liabilities	119,230	108,530
Long-Term Liabilities:
Exchangeable senior notes, net of discount	29,047	28,992
Long-term debt from royalty-bearing instrument	65,480	70,834
Deferred revenue, long-term	17,459	17,192
Other long-term liabilities	1,150	1,150
Total liabilities	232,366	226,698
Commitments and contingencies (Note 6)
Stockholders’ Deficit:
Series A Convertible Preferred Stock, £0.05 par, unlimited authorized; 328,184,640 shares issued and outstanding as of March 31, 2018 and December 31, 2017 (equivalent to 32,818,464 ordinary shares upon future consolidation and redesignation at a 10:1 ratio)	24,364	24,364
Common stock, £0.50 par, unlimited authorized; 295,956,415 issued, 293,584,140 outstanding as of March 31, 2018; 272,719,044 issued, 271,022,011 outstanding as of December 31, 2016	225,246	208,768
Additional paid-in capital	1,036,697	977,866
Treasury stock; 2,372,275 shares as of March 31, 2018; 1,697,033 shares as of December 31, 2017	(6,782)	(4,229)
Accumulated deficit	(1,296,182)	(1,271,869)
Total stockholders’ deficit	(16,657)	(65,100)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	$ 215,709	$ 161,598

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.