CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 75,309	$ 66,260
Investments	75,550	100,218
Trade accounts receivable	1,950	1,860
Inventory	8,599	7,746
Prepaid expenses	1,880	980
Other current assets	712	576
Total current assets	164,000	177,640
Property and equipment, net	7,242	7,303
Right of use assets	487
Intellectual property, net	108	114
Other non-current assets	348	208
Total assets	172,185	185,265
Current liabilities:
Accounts payable	2,505	1,322
Accrued liabilities	3,236	4,962
Accrued interest	191	1,262
Deferred revenue and income	291	217
Current operating lease liability	244
Total current liabilities	6,467	7,763
Noncurrent operating lease liability	243
Other long term liabilities	46	53
Convertible notes	122,461	120,074
Total liabilities	129,217	127,890
Commitments and contingencies
Stockholders’ equity:
Preferred shares	0	0
Common stock	54	54
Contributed capital	440,154	432,885
Treasury Stock	(45,067)	(45,067)
Accumulated deficit	(352,069)	(330,348)
Accumulated other comprehensive loss	(104)	(149)
Total stockholders’ equity	42,968	57,375
Total liabilities and stockholders’ equity	$ 172,185	$ 185,265