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Fair Value of Financial Instruments - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value of Financial Instruments [Line Items] |  |
Restricted cash | $ 527,000 | $ 4,409,000
Fair value of note payable to related party, description | The fair value measurement of the note payable is sensitive to the change in yield. If the yield changes by approximately 1%, from 10% to 11%, the fair value of the note payable with the conversion feature would change from $83.6 million to $82.1 million, or $1.5 million and -1.8%. Similarly, if the yield changes by approximately 3% from 10% to 13%, the fair value of the note payable with the conversion feature would change from $83.6 million to $79.3 million, or $4.3 million and -5.1%. If the yield changes by approximately 4% from 10% to 14%, the fair value of the note payable with the conversion feature would change from $83.6 million to $78.0 million, or $5.6 million and -6.7%. |
Fair value of the liability, percentage decrease | 7.00% |
Minimum |  |
Fair Value of Financial Instruments [Line Items] |  |
Probabilities of meeting the milestones, amount | $ 50,000,000 |
Probabilities of meeting the milestones, percentage decrease | 5.00% |
Fair value of the liability, percentage decrease | 13.00% |
Maximum |  |
Fair Value of Financial Instruments [Line Items] |  |
Probabilities of meeting the milestones, amount | $ 200,000,000 |
Probabilities of meeting the milestones, percentage decrease | 10.00% |
Fair value of the liability, percentage decrease | 25.00% |
Note Payable Yield Changes 1 |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable, percentage of interest rate change | 1.00% |
Change in fair value of note payable value due to change in interest rate percentage | $ 1,500,000 |
Change in fair value of note payable percentage due to change in interest rate percentage | (1.80%) |
Note payable, percentage of yield | 0.11 | 0.10
Note payable to related party, fair value | $ 82,100,000 | $ 83,600,000
Note Payable Yield Changes 2 |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable, percentage of interest rate change | 3.00% |
Change in fair value of note payable value due to change in interest rate percentage | $ 4,300,000 |
Change in fair value of note payable percentage due to change in interest rate percentage | (5.10%) |
Note payable, percentage of yield | 0.13 | 0.10
Note payable to related party, fair value | $ 79,300,000 | $ 83,600,000
Note Payable Yield Changes 3 |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable, percentage of interest rate change | 4.00% |
Change in fair value of note payable value due to change in interest rate percentage | $ 5,600,000 |
Change in fair value of note payable percentage due to change in interest rate percentage | (6.70%) |
Note payable, percentage of yield | 0.14 | 0.10
Note payable to related party, fair value | $ 78,000,000 | $ 83,600,000
Money Market Funds |  |
Fair Value of Financial Instruments [Line Items] |  |
Cash equivalents | 10,400,000 | 48,400,000
Restricted cash | $ 500,000 | $ 4,400,000

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