Nature of Business, Basis of Presentation and Liquidity Risk - Additional Information (Detail) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jul. 31, 2020
shares
|
May 23, 2018 |
Dec. 31, 2020
USD ($)
shares
|
Sep. 30, 2020
USD ($)
|
Jun. 30, 2020
USD ($)
|
Mar. 31, 2020
USD ($)
|
Dec. 31, 2019
USD ($)
shares
|
Sep. 30, 2019
USD ($)
|
Jun. 30, 2019
USD ($)
|
Mar. 31, 2019
USD ($)
|
Dec. 31, 2020
USD ($)
shares
|
Dec. 31, 2019
USD ($)
shares
|
Dec. 31, 2018
USD ($)
|
|
| Accounting Policies [Abstract] | |||||||||||||
| Accumulated deficit | $ (60,434) | $ (45,704) | $ (60,434) | $ (45,704) | |||||||||
| Cash and cash equivalents | 35,853 | 16,664 | 35,853 | 16,664 | |||||||||
| Working capital | 34,000 | 34,000 | |||||||||||
| Net loss | $ (4,724) | $ (3,764) | $ (2,922) | $ (3,320) | $ (3,194) | $ (3,673) | $ (3,624) | $ (5,904) | (14,730) | (16,395) | $ (12,687) | ||
| Net cash used in operations | $ 13,474 | $ 15,216 | $ 10,623 | ||||||||||
| Reverse stock split ratio | 0.05 | 0.1 | |||||||||||
| Common stock, shares authorized | shares | 150,000,000 | 150,000,000 | 150,000,000 | 150,000,000 | 150,000,000 | ||||||||
| X | ||||||||||
- Definition The capital of a business which is used in its day-to-day trading operations, calculated as the current assets minus the current liabilities. No definition available.
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- References No definition available.
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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