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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
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 as of December 31, 2018 is based on discounted cash flow model and it is sensitive to the change in yield. If the yield changes by approximately 2%, the fair value of the note payable with the conversion feature would change approximately 3.8%. Similarly, if the yield changes by approximately 6%, the fair value of the note payable with the conversion feature would change approximately 11.1%. If the yield changes by approximately 8%, the fair value of the note payable with the conversion feature would change approximately 15.0% |
Fair value of the liability, percentage decrease | 6.00% |
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 | 2.00% |
Change in fair value of note payable percentage due to change in interest rate percentage | 3.80% |
Note Payable Yield Changes 2 |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable, percentage of interest rate change | 6.00% |
Change in fair value of note payable percentage due to change in interest rate percentage | 11.10% |
Note Payable Yield Changes 3 |  |
Fair Value of Financial Instruments [Line Items] |  |
Note payable, percentage of interest rate change | 8.00% |
Change in fair value of note payable percentage due to change in interest rate percentage | 15.00% |
Money Market Funds |  |
Fair Value of Financial Instruments [Line Items] |  |
Cash equivalents | $ 71,700,000 | 48,400,000
Restricted cash | $ 500,000 | $ 4,400,000

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