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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Revenues $ 189 $ 30 $ 335 $ 45
Costs and expenses:        
Costs of revenues 1,233 116 2,409 151
Research and development 5,987 4,021 11,942 9,768
Selling, general and administrative 11,210 13,067 25,664 24,113
Total costs and expenses 18,430 17,204 40,015 34,032
Loss from operations (18,241) (17,174) (39,680) (33,987)
Interest income, net 161 101 335 145
Other (expense) income, net (22) (28) (49) 6
Loss from equity method investment (416) (389) (807) (860)
Loss before income taxes (18,518) (17,490) (40,201) (34,696)
Income tax expense 50 0 125 0
Net loss $ (18,568) $ (17,490) $ (40,326) $ (34,696)
Net loss per share—basic and diluted (in dollars per share) $ (0.62) $ (0.64) $ (1.41) $ (1.29)
Weighted average number of shares used in net loss per share—basic and diluted (in shares) 30,036 27,198 28,668 26,894
Net loss $ (18,568) $ (17,490) $ (40,326) $ (34,696)
Unrealized gains (losses) on available-for-sale securities 16 (93) 179 (68)
Comprehensive loss $ (18,552) $ (17,583) $ (40,147) $ (34,764)