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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
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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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