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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Fair Value of Financial Instruments [Line Items] |  |
Restricted cash | $ 527,000 | $ 4,409,000
Note payable, percentage of interest rate change | 1.00% |
Fair value of note payable to related party, description | The fair value measurement of the note payable is sensitive to the change in interest rate. If the interest rate changes by approximately 1%, the fair value of the note payable would change by $1 million or 1.4%. |
Change in fair value of note payable value due to change in interest rate percentage | $ 1,000,000 |
Change in fair value of note payable percentage due to change in interest rate percentage | 1.40% |
Fair value of the liability, percentage decrease | 8.00% |
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% |
Money Market Funds |  |
Fair Value of Financial Instruments [Line Items] |  |
Cash equivalents | $ 23,400,000 | 41,000,000
Restricted cash | $ 500,000 | $ 4,400,000

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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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