Stock Warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
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12 Months Ended |
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Jul. 14, 2021 |
Jan. 01, 2018 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Jun. 30, 2021 |
Dec. 31, 2019 |
Dec. 31, 2015 |
| Common stock, Shares issued |
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185,993,058
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39,510,108
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| Class of warrants of rights, Number of warrants or rights vested during period |
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110,212
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140,260
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| Increase or decrease derivative liabilities |
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$ 600
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$ 700
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| Class of warrants or rights non vested outstanding |
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0
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| Warrants recognized liability at fair value |
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$ (1,808)
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$ 175
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| Public Warrant [Member] |
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| Warrants recognized in Shareholder equity Fair Value |
$ 9,700
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| Warrant [Member] |
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| Common stock, Shares issued |
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179,572
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| Warrants And Rights Exercised and Expiry Date |
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Sep. 24, 2029
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| Warrant [Member] | Loan Agreement [Member] | Right To Purchase Shares Of Common Stock [Member] |
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| Class of warrants and rights issued during period, Shares |
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180,928
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| Class of Warrant or Right, Exercise Price of Warrants or Rights |
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$ 0.06
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| Loan agreement termination date |
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Jan. 01, 2018
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| Warrants and Rights Outstanding, Maturity Date |
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Feb. 17, 2025
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| Warrant [Member] | Development Agreement [Member] | Right To Purchase Shares Series D Convertible Preferred Stock [Member] |
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| Class of warrants and rights issued during period, Shares |
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280,528
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| Class of Warrant or Right, Exercise Price of Warrants or Rights |
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$ 0.0001
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| Warrant [Member] | Private Placement [Member] |
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| Warrants recognized liability at fair value |
$ 5,700
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|
$ 2,600
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| Warrant [Member] | Private Placement [Member] | Fair value of derivative liabilities |
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| Warrants recognized liability at fair value |
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$ 3,100
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