Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 31,807	$ 49,326
Trade and other receivables, net	6,955	13,130
Inventories, net	2,461	2,859
Prepaid expenses and other current assets	3,402	2,999
Total current assets	44,625	68,314
Property and equipment, net	6,873	9,726
Right-of-use assets, net	3,448	0
Intangible assets, net	102	153
Other non-current assets	7,836	286
Total assets	62,884	78,479
Current liabilities:
Accounts payable	7,089	12,274
Accrued expenses	8,569	5,475
Lease liabilities, current	728	0
Deferred revenue	693	806
Liability related to the sale of future revenue, current	1,450	0
Loans payable, current	2,575	0
Total current liabilities	21,104	18,555
Loans payable, net	34,329	60,338
Liability related to the sale of future revenue, net	47,524	0
Lease liabilities	2,846	0
Deferred revenue, net of current portion	3,633	4,348
Other non-current liabilities	1,945	1,360
Total liabilities	111,381	84,601
Contingencies (note 20)
Stockholders' deficit:
Common stock, $0.001 par value. Authorized 250,000,000 shares; 34,569,254 and 33,562,885 shares issued and outstanding at December 31 2020 and 2019, respectively	35	34
Additional paid-in capital	137,725	124,318
Accumulated deficit	(186,257)	(130,474)
Total stockholders' deficit	(48,497)	(6,122)
Total liabilities and stockholders' deficit	$ 62,884	$ 78,479