CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 126,847	$ 28,513
Investments	66,754	80,648
Trade accounts receivable	1,065	1,946
Inventory	10,127	8,063
Prepaid expenses	1,538	850
Other current assets	804	468
Total current assets	207,135	120,488
Property and equipment, net	5,851	4,890
Intellectual property, net	129	134
Total assets	213,115	125,512
Current liabilities:
Accounts payable	2,758	2,080
Accrued liabilities	4,578	3,636
Deferred revenue and income	117	1,071
Total current liabilities	7,453	6,787
Other long term liabilities	25	21
Convertible notes	99,162	0
Total liabilities	106,640	6,808
Commitments and contingencies
Stockholders’ equity:
Preferred shares	0	0
Common stock	54	56
Contributed capital	414,262	360,620
Treasury Stock	(45,067)	0
Accumulated deficit	(262,833)	(241,972)
Accumulated other comprehensive loss	59	0
Total stockholders’ equity	106,475	118,704
Total liabilities and stockholders’ equity	$ 213,115	$ 125,512

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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).