Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 81,967	$ 89,300
Gross Unrealized Losses	(6)	(67)
Fair Value	81,961	89,233
Cash and Cash Equivalents	75,105	40,651
Short-term investments	6,862	48,415
Long-term investments	0	234
Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	27,516	41,228
Gross Unrealized Losses	(6)	(57)
Fair Value	27,510	41,171
Cash and Cash Equivalents	20,884	7,849
Short-term investments	6,632	33,379
Long-term investments	0	0
Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		15,270
Gross Unrealized Losses		(10)
Fair Value		15,260
Cash and Cash Equivalents		0
Short-term investments		15,036
Long-term investments		234
Level 2 \| State and municipal obligations
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	992	14,477
Gross Unrealized Losses	0	(10)
Fair Value	992	14,467
Cash and Cash Equivalents	762	0
Short-term investments	230	14,243
Long-term investments	0	234
Level 2 \| Certificates of deposit
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost		793
Gross Unrealized Losses		0
Fair Value		793
Cash and Cash Equivalents		0
Short-term investments		793
Long-term investments		0
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	53,459	32,802
Gross Unrealized Losses	0	0
Fair Value	53,459	32,802
Cash and Cash Equivalents	53,459	32,802
Short-term investments	0	0
Long-term investments	0	0
Money market funds \| Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	20,884	7,849
Gross Unrealized Losses	0	0
Fair Value	20,884	7,849
Cash and Cash Equivalents	20,884	7,849
Short-term investments	0	0
Long-term investments	0	0
Corporate bonds \| Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	6,632	33,379
Gross Unrealized Losses	(6)	(57)
Fair Value	6,626	33,322
Cash and Cash Equivalents	0	0
Short-term investments	6,632	33,379
Long-term investments	$ 0	$ 0

Cash cash equivalent and investments amortized cost.

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

+ References

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