CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 72,956	$ 43,759
Restricted cash	855	825
Short-term bank deposits	0	12,102
Investment in marketable securities (Note 6)	3,046	16,246
Restricted investment in marketable securities (Note 6)	0	434
Trade receivables, net of allowances	11,189	135
Prepaid and other assets	3,466	1,557
Inventory (Note 7)	6,650	1,356
TOTAL CURRENT ASSETS	98,162	76,414
NON-CURRENT ASSETS:
Property and equipment, net	2,744	2,885
Operating lease right-of-use assets (Note 10)	2,191	1,694
Prepaid and other assets	4,586	166
TOTAL NON-CURRENT ASSETS	9,521	4,745
TOTAL ASSETS	107,683	81,159
CURRENT LIABILITIES:
Trade payables	4,622	19,352
Accrued expenses (Note 4)	12,132	3,381
Employee related obligations	5,294	5,231
Operating lease liabilities (Note 10)	1,098	1,092
Other	46	270
TOTAL CURRENT LIABILITIES	23,192	29,326
LONG-TERM LIABILITIES:
Liability for employee severance benefits	409	424
Operating lease liabilities (Note 10)	1,092	653
Long-term debt (Note 8)	33,017	32,725
Other liabilities	457	456
TOTAL LONG-TERM LIABILITIES	34,975	34,258
TOTAL LIABILITIES	58,167	63,584
COMMITMENTS AND CONTINGENCIES (Note 11)	0	0
STOCKHOLDERS' EQUITY:
Preferred stock: $0.0001 par value; 20,000,000 shares authorized at September 30, 2020 and December 31, 2019, respectively; no shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	0	0
Common stock: $0.0001 par value; 300,000,000 shares authorized at September 30, 2020 and December 31, 2019, respectively; 167,859,461 and 36,480,314 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	17	3
Additional paid-in capital	592,514	328,154
Accumulated deficit	(543,015)	(310,587)
Accumulated other comprehensive income	0	5
TOTAL SHAREHOLDERS' EQUITY	49,516	17,575
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 107,683	$ 81,159