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v3.19.1

Redeemable Convertible Preferred Stock - Preferred Stock and Warrants Calculated Using the Black Scholes Merton Pricing Model (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 $ / shares shares | Mar. 23, 2017 $ / shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Number of warrants | shares | 325,000 |
Weighted-average fair value of warrants | $ 3.11 | $ 0.73
Expiration date | May 02, 2020 |
Exercise Price |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants outstanding, measurement input | 6.62 |
Expected Volatility of Underlying Stock |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants outstanding, measurement input | 0.74 | 0.72
Risk-Free Interest Rate |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants outstanding, measurement input | 0.0162 | 0.0208
Dividend Yield |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Warrants outstanding, measurement input | 0.00 | 0.00
Expected Life of Warrants |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Expected life of warrants | 8 years | 5 years

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- Definition Expiration date of warrants held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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