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STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING EXPENSES      
Research and development $ 7,174 $ 5,677 $ 4,527
General and administrative 9,232 4,265 3,867
Sales and marketing 2,443 1,198 324
Total operating expenses 18,849 11,140 8,718
Loss from operations (18,849) (11,140) (8,718)
OTHER EXPENSES, NET      
Loss on sale of available-for-sale securities and other expenses, net (309) 0 0
Interest expense, net (217) (28) (19)
Other income, net 0 0 2
Total other expenses, net (526) (28) (17)
NET LOSS $ (19,375) $ (11,168) $ (8,735)
Basic and diluted net loss per share (in dollars per share) $ (0.64) $ (0.42) $ (0.42)
Weighted average shares outstanding: basic and diluted (in shares) 30,195 26,529 21,009