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Impairment of right-of-use assets.

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Significant accounting policies.

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Working capital.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items]
Cash and cash equivalents		$ 60,062,000	$ 65,134,000
Accumulated deficit		(485,948,000)	(470,111,000)
Working capital		$ 56,700,000
Number of operating segment \| Segment		1
Cash and cash equivalents, restricted cash maturity period		Three months or less
Lessee, operating lease, existence of option to extend	true	true
Lessee, operating lease, existence of option to terminate	true	true
Impairments of long-lived assets		$ 2,870,000	$ 0
Impairments of right-of-use assets	$ 2,372,024
leasehold improvement assets	$ 498,023
Assembled Workforce [Member]
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets		3 years
Discounted Cash Flows [Member]
Significant Accounting Policies [Line Items]
Right-of-use and leasehold improvement assets, discount rate	0.095
Minimum [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives		3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful lives		5 years