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Asset Purchase Agreement with Azaya Therapeutics - Additional Information (Details) - Azaya Therapeutics, Inc. [Member] $ in Thousands |  | 6 Months Ended |
--- | --- | --- | ---
Feb. 15, 2017 USD ($) Candidate shares | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |
Total consideration | $ 4,300 |  |  |
Fair value of the common stock issued | 2,300 |  |  |
Assumed liabilities | 1,800 |  |  |
Acquisition costs | 200 |  |  |
In process research and development expense | 1,700 | $ 0 | $ 1,686 |
Asset Purchase Agreement |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Book value of tangible assets acquired | $ 3,000 |  |  |
Common stock, shares issued | shares | 117,325 |  |  |
Common stock, shares issued after closing date | shares | 87,994 |  |  |
Common stock deposited in escrow | shares | 29,331 |  |  |
Obligation to pay on existing payables assumed | $ 1,800 |  |  |
Existing payables, paid during the period |  |  |  | $ 1,800
Asset Purchase Agreement | IPR&D [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of drug candidates acquired | Candidate | 2 |  |  |

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