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Condensed Consolidated Statements of Operations and Comprehensive Loss (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 27 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013
Operating expenses: |  |  |  |  |
Research and development | $ 2,576 | $ 1,351 | $ 5,256 | $ 2,297 | $ 12,749
General and administrative | 3,445 | 1,883 | 5,940 | 3,903 | 14,600
Total operating expenses | 6,021 | 3,234 | 11,196 | 6,200 | 27,349
Loss from operations | (6,021) | (3,234) | (11,196) | (6,200) | (27,349)
Interest income | 25 |  | 43 |  | 62
Net loss | (5,996) | (3,234) | (11,153) | (6,200) | (27,287)
Accretion of convertible preferred stock to redemption value |  |  |  |  | (101)
Net loss applicable to common stockholders | (5,996) | (3,234) | (11,153) | (6,200) | (27,388)
Net loss per share applicable to common stockholders-basic and diluted (in dollars per share) | $ (0.36) | $ (2.09) | $ (0.74) | $ (4.22) | $ (4.35)
Weighted average number of common shares used in net loss per share applicable to common stockholders-basic and diluted (in shares) | 16,869 | 1,548 | 15,132 | 1,469 | 6,302
Net loss | (5,996) | (3,234) | (11,153) | (6,200) | (27,287)
Other comprehensive loss |  |  |  |  |
Unrealized losses on available-for-sale securities | (27) |  | (20) |  | (26)
Comprehensive loss | (6,023) | (3,234) | (11,173) | (6,200) | (27,313)
Non-cash stock-based compensation expenses included in operating expenses are as follows: |  |  |  |  |
Stock-based compensation expense |  |  | 2,211 | 559 | 3,939
Research and development |  |  |  |  |
Non-cash stock-based compensation expenses included in operating expenses are as follows: |  |  |  |  |
Stock-based compensation expense | 609 | 256 | 1,035 | 493 | 2,447
General and administrative |  |  |  |  |
Non-cash stock-based compensation expenses included in operating expenses are as follows: |  |  |  |  |
Stock-based compensation expense | $ 765 | $ 43 | $ 1,176 | $ 113 | $ 1,492

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