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Kolltan Acquisition- Purchase Price (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Nov. 29, 2016 | Dec. 31, 2016 | Jun. 30, 2017
Acquisition-date fair value of consideration transferred |  |  |
Fair value of contingent consideration |  | $ 44,200 | $ 48,600
Kolltan |  |  |
Kolltan Acquisition |  |  |
Shares issued as part of consideration (in shares) | 18,257,996 |  |
Shares issuable in lieu of cash severance obligations (in shares) | 437,901 |  |
Shares issued in lieu of cash severance obligations (in shares) |  |  | 75,637
Remaining obligation (in shares) |  |  | 150,185
Maximum amount of milestone payments | $ 172,500 |  |
Closing price of common stock (in dollars per share) | $ 4.02 |  |
Acquisition-date fair value of consideration transferred |  |  |
Fair value of common stock issued for upfront payment | $ 73,397 |  |
Fair value of contingent consideration | 44,200 |  |
Kolltan transaction expenses paid in cash by the Company | 3,768 |  |
Total consideration transferred | $ 121,365 |  |
Contingent consideration, noncurrent |  | 44,200 | $ 48,600
Range of estimated milestone payment, minimum |  | 0 |
Range of estimated milestone payment, maximum |  | $ 172,500 |
Level 3 | Kolltan | Minimum |  |  |
Acquisition-date fair value of consideration transferred |  |  |
Discount rate (as a percent) | 10.00% |  |
Level 3 | Kolltan | Maximum |  |  |
Acquisition-date fair value of consideration transferred |  |  |
Discount rate (as a percent) | 11.00% |  |

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