Consolidated Financial Statements Details - Schedule of Other Expense, Net (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Other Income and Expenses [Abstract] | ||
| Interest expense | $ (4,236) | $ (3,890) |
| Interest income | 211 | 6 |
| Stock warrants issued | (5,790) | |
| Write-off of deferred debt discounts and issuance costs | (10,132) | |
| Gain on fair value change of warrant liability | 7,114 | 950 |
| Other | (259) | |
| Other expense, net | $ (12,833) | $ (3,193) |
| X | ||||||||||
- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of gain (loss) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Costs of warrants issued. No definition available.
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| X | ||||||||||
- Definition Interest income. No definition available.
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| X | ||||||||||
- Definition Write off of deferred debt discounts and issuance costs. No definition available.
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