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CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenue: |  |  |  |  |  |  |
License revenue | $ 911 | $ 2,198 | $ 1,823 | $ 5,948 | $ 9,057 | $ 2,325 | $ 0
Royalty revenue | 0 | 0 | 0 | 1,424 | 1,424 | 4,750 | 3,585
Grant revenue |  |  |  |  | 0 | 42 | 483
Total revenue | 911 | 2,198 | 1,823 | 7,372 | 10,481 | 7,117 | 4,068
Operating expenses: |  |  |  |  |  |  |
Research and development | 748 | 1,789 | 1,698 | 5,701 | 8,309 | 10,610 | 11,206
General and administrative | 713 | 701 | 1,609 | 1,792 | 3,063 | 4,877 | 3,368
Total operating expenses | 1,461 | 2,490 | 3,307 | 7,493 | 11,372 | 15,487 | 14,574
Loss from operations | (550) | (292) | (1,484) | (121) | (891) | (8,370) | (10,506)
Other income (expense): |  |  |  |  |  |  |
Interest expense, net | 0 | 0 | 0 | (1,569) | (1,568) | (4,861) | (6,430)
Other income (expense), net | (8) | (6) | (14) | 10,438 | 10,433 | (183) | (129)
Non-cash gain (loss) on changes in the fair value of warrants | (284) | 5,362 | (1,148) | 2,317 | 1,737 | (1,766) | 1,862
Other income (expense), net | (292) | 5,356 | (1,162) | 11,186 | 10,602 | (6,810) | (4,697)
Net income (loss) and comprehensive income (loss) applicable to common stockholders | $ (842) | $ 5,064 | $ (2,646) | $ 11,065 | $ 9,711 | $ (15,180) | $ (15,203)
Basic net income (loss) per common share (in dollars per share) | $ (0.01) | $ 0.06 | $ (0.03) | $ 0.14 | $ 0.12 | $ (0.23) | $ (0.26)
Diluted net income (loss) per common share (in dollars per share) | $ (0.01) | $ 0.00 | $ (0.03) | $ 0.10 | $ 0.10 | $ (0.23) | $ (0.28)
Weighted average shares used in computing basic net income (loss) per common share (in shares) | 88,998 | 82,527 | 88,964 | 80,403 | 82,099 | 66,509 | 59,324
Weighted average shares used in computing diluted net income (loss) per common share (in shares) | 88,998 | 82,559 | 88,964 | 86,271 | 82,659 | 66,509 | 60,392

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