Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 9,500	$ 14,694	$ 2,875
Accounts receivable, net, including $507 thousand, $442 thousand, $464 thousand from related parties as of March 31, 2021, December 31, 2020 and December 31, 2019, respectively	1,618	844	709
Inventory	2,223	1,627	990
Prepaid expenses and other current assets	953	1,061	783
Total current assets	14,294	18,226	5,357
Property and equipment, net	1,360	1,324	1,770
Goodwill	1,302	1,397	1,325
Intangible assets, net	914	988	1,313
Other assets	274	291	497
Total assets	18,144	22,226	10,262
Current liabilities:
Accounts payable and accrued expenses	3,140	3,182	2,383
Deferred revenue	505	674	0
Development loan	10,000	10,000	5,000
Revolving credit facility, including accrued interest	10,150	10,153	10,458
Unfunded commitment to joint venture	1,866	1,466	1,688
Accrued payroll and benefits	1,410	1,215	1,159
Total current liabilities	27,071	26,690	20,688
Development loans, net of current portion	0	0	10,000
Promissory note	16,128	15,392	16,169
Total liabilities	43,199	42,082	46,857
Commitments and contingencies (Note 11)
Total convertible preferred stock	0	0	85,658
Stockholders’ deficit:
Common stock, $0.0001 par value; 750,000,000 shares authorized as of March 31, 2021 and December 31, 2020, and 40,531,996 and 40,278,496 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively; 29,012,034 shares authorized and 4,220,998 shares issued and outstanding as of December 31, 2019	4	4	0
Additional paid-in capital	144,201	142,736	22,404
Accumulated deficit	(168,403)	(161,824)	(143,915)
Accumulated other comprehensive loss	(857)	(772)	(742)
Total stockholders’ deficit	(25,055)	(19,856)	(122,253)
Total liabilities, convertible preferred stock and stockholders’ deficit	18,144	22,226	10,262
Series 1 Preferred Stock
Current liabilities:
Total convertible preferred stock	0	0	39,658
Series 2 Preferred Stock
Current liabilities:
Total convertible preferred stock	0	0	30,000
Series 3 Preferred Stock
Current liabilities:
Total convertible preferred stock	$ 0	$ 0	$ 16,000