CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 39,085	$ 27,868
Restricted cash	250	250
Short term bank deposits	16,187	24,047
Investment in marketable securities (Note 4)	14,091	46,669
Restricted investment in marketable securities (Note 4)	282	268
Accounts receivable:
Trade	308	1,066
Other	1,511	999
TOTAL CURRENT ASSETS	71,714	101,167
NON-CURRENT ASSETS:
Investment in marketable securities (Note 4)		150
Restricted investment in marketable securities (Note 4)	139	133
Property and equipment, net	2,497	2,235
Operating lease right of use assets (Note 6)	1,858
Other	18	46
TOTAL NON-CURRENT ASSETS	4,512	2,564
TOTAL ASSETS	76,226	103,731
Accounts payable and accruals:
Trade	9,434	6,327
Operating lease liabilities (Note 6)	999
Other	3,664	4,141
TOTAL CURRENT LIABILITIES	14,097	10,468
LONG-TERM LIABILITIES:
Liability for employee severance benefits	409	367
Operating lease liabilities (Note 6)	882
Other liabilities	456	714
TOTAL LONG-TERM LIABILITIES	1,747	1,081
TOTAL LIABILITIES	15,844	11,549
COMMITMENTS (Note 6)
SHAREHOLDERS' EQUITY:
Ordinary Shares, NIS 0.16 par value - authorized: 135,000,000 and 90,000,000 Ordinary Shares as of June 30, 2019 and December 31, 2018, respectively; issued and outstanding: 54,455,969 and 54,351,140 Ordinary Shares as of June 30, 2019 and December 31, 2018, respectively	2,336	2,331
Additional paid-in capital	307,653	305,303
Accumulated deficit	(249,606)	(215,409)
Accumulated other comprehensive loss	(1)	(43)
TOTAL SHAREHOLDERS' EQUITY	60,382	92,182
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 76,226	$ 103,731