Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 49,326	$ 60,599
Trade and other receivables, net	13,130	6,481
Inventories	2,859	5,441
Prepaid expenses and other current assets	2,999	1,680
Total current assets	68,314	74,201
Property and equipment, net	9,726	12,207
Intangible assets, net and other assets	439	443
Total assets	78,479	86,851
Current liabilities:
Accounts payable	12,274	20,436
Accrued expenses	5,475	7,195
Deferred revenue	806	721
Loans payable, current	0	4,600
Total current liabilities	18,555	32,952
Loans payable, net	60,338	42,603
Deferred revenue, net of current portion	4,348	0
Asset retirement obligations	1,360	1,216
Total liabilities	84,601	76,771
Commitments and contingencies (note 18)
Stockholders' (deficit)/equity:
Common stock, $.001 par value. Authorized 250,000,000 shares; 33,562,885 and 24,957,309 shares issued and outstanding at December 31, 2019 and 2018, respectively	34	25
Additional paid-in capital	124,318	71,431
Accumulated deficit	(130,474)	(61,376)
Total stockholders' (deficit)/equity	(6,122)	10,080
Total liabilities and stockholders' (deficit)/equity	$ 78,479	$ 86,851