Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2020
USD ($)
Segment
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Dec. 31, 2019
USD ($)
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Dec. 31, 2018
USD ($)
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| Subsidiary, Sale of Stock [Line Items] | |||
| Cash, cash equivalents, and restricted cash | $ | $ 93,314 | $ 42,193 | $ 11,767 |
| Operating segments (number) | Segment | 1 | ||
| ASU 2018-13 | |||
| Subsidiary, Sale of Stock [Line Items] | |||
| Change in Accounting Principle, Accounting Standards Update, Adopted | true | ||
| Change in Accounting Principle, Accounting Standards Update, Adoption Date | Dec. 31, 2020 | ||
| Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true | ||
| Accounting Standards Update [Extensible List] | ASU 2018-13 | ||
| 6.0% April 2020 and March 2019 Convertible Senior Notes | |||
| Subsidiary, Sale of Stock [Line Items] | |||
| Interest rate | 6.00% |
| X | ||||||||||
- Definition Indicates amendment to accounting standards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Indicates (true false) whether accounting standards update was adopted. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Date accounting standards update was adopted, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Indicates (true false) whether effect from applying amendment to accounting standards is immaterial. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition 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. No definition available.
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- Details
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- Details
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