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Summary of Significant Accounting Policies - Summary of Available-for-sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 115,818 | $ 113,803
Gross Unrealized Gains | 286 | 0
Gross Unrealized Losses | (326) | (917)
Fair Value | 115,778 | 112,886
Guaranteed Investment Certificates [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,181 | 23,096
Gross Unrealized Gains | 0 | 0
Fair Value | 24,181 | 23,096
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 91,637 | 90,707
Gross Unrealized Gains | 286 | 0
Gross Unrealized Losses | (326) | (917)
Fair Value | 91,597 | $ 89,790
Less Than One Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 78,271 |
Gross Unrealized Gains | 183 |
Gross Unrealized Losses | (239) |
Fair Value | 78,215 |
Greater Than One Year [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 37,547 |
Gross Unrealized Gains | 103 |
Gross Unrealized Losses | (87) |
Fair Value | $ 37,563 |

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