CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 92,938	$ 66,260
Investments	28,978	100,218
Trade accounts receivable	2,642	1,860
Inventory	7,881	7,746
Prepaid expenses	1,163	980
Other current assets	793	576
Total current assets	134,395	177,640
Property and equipment, net	8,566	7,303
Right of use assets	3,834
Other non-current assets	483	322
Total assets	147,278	185,265
Current liabilities:
Accounts payable	2,281	1,322
Accrued liabilities	2,985	4,962
Accrued interest	191	1,262
Deferred revenue	250	217
Current operating lease liability	421
Total current liabilities	6,128	7,763
Non-current operating lease liability	3,458
Other non-current liabilities	28	53
Convertible notes	127,444	120,074
Total liabilities	137,058	127,890
Commitments and contingencies
Stockholders’ equity:
Preferred shares	0	0
Common stock	55	54
Contributed capital	448,609	432,885
Treasury stock	(45,067)	(45,067)
Accumulated deficit	(393,318)	(330,348)
Accumulated other comprehensive loss	(59)	(149)
Total stockholders’ equity	10,220	57,375
Total liabilities and stockholders’ equity	$ 147,278	$ 185,265