Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 27,498	$ 31,807
Trade and other receivables, net	10,209	6,955
Inventories, net	2,799	2,461
Prepaid expenses and other current assets	3,937	3,402
Total current assets	44,443	44,625
Property and equipment, net	6,279	6,873
Right-of-use assets, net	3,277	3,448
Intangible assets, net	89	102
Other non-current assets	7,835	7,836
Total assets	61,923	62,884
Current liabilities:
Accounts payable	6,687	7,089
Accrued expenses	6,371	8,569
Lease liabilities, current	787	728
Deferred revenue, current	437	693
Liability related to the sale of future revenue, current	1,905	1,450
Loans payable, current	3,863	2,575
Total current liabilities	20,050	21,104
Loans payable, net	34,193	34,329
Liability related to the sale of future revenue, net	50,383	47,524
Lease liabilities	2,635	2,846
Deferred revenue	4,699	3,633
Other non-current liabilities	1,761	1,945
Total liabilities	113,721	111,381
Contingencies (note 19)
Stockholders' deficit:
Common stock, $.001 par value. Authorized 250,000,000 shares; 36,241,358 and 34,569,254 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	36	35
Additional paid-in capital	149,095	137,725
Accumulated deficit	(200,929)	(186,257)
Total stockholders' deficit	(51,798)	(48,497)
Total liabilities and stockholders' deficit	$ 61,923	$ 62,884