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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:      
Net loss $ (37,066) $ (31,506) $ (20,163)
Adjustments required to reconcile net loss to net cash used in operating activities:      
Stock-based compensation 2,633 3,084 3,773
Depreciation 1,593 1,484 1,106
Increase (decrease) in Severance pay, net (33) 101 120
Gain from sale of marketable securities (383) (436)
Loss from property and equipment disposals 37
Amortization of the Research and Development Component within research and development funding arrangement (421)
Decrease (increase) in interest receivables from short-term bank deposits 247 303 (399)
Decrease (increase) in trade receivable 7,800 (7,800)
Decrease (increase) in other accounts receivable and prepaid expenses 422 206 (777)
Decrease (increase) in long-term prepaid expenses (18) 9 7
Increase (decrease) in trade payables and other accounts payable and accrued expenses 1,564 (605) 823
Decrease in deferred revenues (312) (1,477)
Net cash used in operating activities (30,658) (19,819) (25,607)
Cash flows from investing activities:      
Proceeds from maturity of short-term bank deposits 71,560 69,000 47,000
Investment in short-term and long-term bank deposits (24,900) (50,561) (34,000)
Purchase of property and equipment (385) (2,599) (3,120)
Proceeds from sale of marketable securities 369 423
Net cash provided by investing activities 46,275 16,209 10,303
Cash flows from financing activities:      
Proceeds from exercise of options 201 2,458 972
Net cash provided by financing activities 201 2,458 972
Increase (decrease) in cash, cash equivalents and restricted cash 15,818 (1,152) (14,332)
Cash, cash equivalents and restricted cash at the beginning of the year 10,702 11,854 26,186
Cash and cash equivalents and restricted cash at the end of the year 26,520 10,702 11,854
Supplemental disclosure of non-cash investing and financing activities:      
Change in receivables from foreign currency derivative contracts (10) 7 (141)
Changes in other accounts payable from foreign currency derivative contracts 19 (19)
Purchase of property and equipment 33 143 1,321
Cash paid (received) during the year for:      
Income taxes 20
Interest payments received from bank short-term deposits and cash equivalents $ 640 $ (1,032) $ (415)