Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 22,165	$ 60,599
Trade and other receivables, net	10,150	6,481
Inventories, net	4,647	5,441
Prepaid expenses and other current assets	2,102	1,680
Total current assets	39,064	74,201
Property and equipment, net	10,933	12,207
Intangible assets, net	178	204
Other assets	233	239
Total assets	50,408	86,851
Current liabilities:
Accounts payable and accrued expenses	23,479	27,631
Deferred revenue, current	600	721
Loans payable, current	550	4,600
Total current liabilities	24,629	32,952
Loans payable, net	46,884	42,603
Deferred revenue, net of current portion	2,266	0
Asset retirement obligations	1,286	1,216
Total liabilities	75,065	76,771
Commitments and contingencies (Note 17)
Shareholders' (deficit)/equity:
Common stock, $.001 par value. Authorized 250,000,000 shares; 25,022,660 and 24,957,309 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	25	25
Additional paid-in capital	74,744	71,431
Accumulated deficit	(99,426)	(61,376)
Total shareholders' (deficit)/equity	(24,657)	10,080
Total liabilities and shareholders' (deficit)/equity	$ 50,408	$ 86,851