CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 87,469	$ 66,260
Investments	50,349	100,218
Trade accounts receivable	1,911	1,860
Inventory	8,298	7,746
Prepaid expenses	1,342	980
Other current assets	805	576
Total current assets	150,174	177,640
Property and equipment, net	7,624	7,303
Right of use assets	375
Other non-current assets	471	322
Total assets	158,644	185,265
Current liabilities:
Accounts payable	1,819	1,322
Accrued liabilities	3,976	4,962
Accrued interest	1,262	1,262
Deferred revenue and income	255	217
Current operating lease liability	200
Total current liabilities	7,512	7,763
Non-current operating lease liability	175
Other non-current liabilities	35	53
Convertible notes	124,917	120,074
Total liabilities	132,639	127,890
Commitments and contingencies
Stockholders’ equity:
Preferred shares	0	0
Common stock	55	54
Contributed capital	443,857	432,885
Treasury stock	(45,067)	(45,067)
Accumulated deficit	(372,884)	(330,348)
Accumulated other comprehensive income (loss)	44	(149)
Total stockholders’ equity	26,005	57,375
Total liabilities and stockholders’ equity	$ 158,644	$ 185,265