CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 66,810	$ 28,513
Investments	130,594	80,648
Trade accounts receivable	1,823	1,946
Inventory	11,317	8,063
Prepaid expenses	1,421	850
Other current assets	643	468
Total current assets	212,608	120,488
Property and equipment, net	5,443	4,890
Intellectual property, net	124	134
Other non-current assets	78	0
Total assets	218,253	125,512
Current liabilities:
Accounts payable	2,355	2,080
Accrued liabilities	5,302	3,636
Deferred revenue and income	185	1,071
Total current liabilities	7,842	6,787
Other long term liabilities	26	21
Convertible notes	115,499	0
Total liabilities	123,367	6,808
Commitments and contingencies
Stockholders’ equity:
Preferred shares	0	0
Common stock	54	56
Contributed capital	426,091	360,620
Treasury Stock	(45,067)	0
Accumulated deficit	(286,058)	(241,972)
Accumulated other comprehensive loss	(134)	0
Total stockholders’ equity	94,886	118,704
Total liabilities and stockholders’ equity	$ 218,253	$ 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).