CONDENSED CONSOLIDATED BALANCE SHEET - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 47,368	$ 61,014
Investments	41,326	47,437
Trade accounts receivable	2,592	3,222
Inventory	8,723	8,059
Prepaid expenses	1,400	955
Other current assets	1,099	1,165
Total current assets	102,508	121,852
Property and equipment, net	8,004	7,905
Right of use assets	3,569	3,917
Other non-current assets	734	750
Total assets	114,815	134,424
Current liabilities:
Accounts payable	2,702	2,351
Accrued liabilities	3,346	3,828
Accrued interest	1,262	1,262
Deferred revenue	232	271
Current portion of long-term debt	2,129	0
Current operating lease liability	447	450
Total current liabilities	10,118	8,162
Non-current operating lease liability	3,366	3,579
Other non-current liabilities	190	19
Long-term debt	2,662	0
Convertible notes	135,469	130,043
Total liabilities	151,805	141,803
Commitments and contingencies
Stockholders’ deficit:
Preferred shares	0	0
Common stock	56	55
Contributed capital	463,178	452,344
Treasury stock	(45,067)	(45,067)
Accumulated deficit	(455,297)	(414,653)
Accumulated other comprehensive income (loss)	140	(58)
Total stockholders’ deficit	(36,990)	(7,379)
Total liabilities and stockholders’ deficit	$ 114,815	$ 134,424
Preferred Stock, par value (usd per share)	$ 0.001	$ 0.001
Preferred Stock, shares authorized (shares)	5,000,000	5,000,000
Common Stock, par value (usd per share)	$ 0.001	$ 0.001