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Convertible Preferred Stock - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
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Jun. 25, 2021 shares | Jan. 31, 2020 USD ($) $ / shares shares | Feb. 28, 2019 USD ($) $ / shares shares | Feb. 28, 2018 USD ($) shares $ / shares | Sep. 30, 2016 USD ($) shares | Aug. 31, 2015 USD ($) shares | Jun. 30, 2012 USD ($) shares | Oct. 31, 2011 USD ($) shares | Jun. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Oct. 01, 2011 USD ($)
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  |  |  |  |  |  |  |  |  | 135,936,731 |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  | $ 99,414 |
Stock Purchase Agreement with Venture Investor |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Funding commitment |  |  |  |  |  |  |  |  |  |  | $ 10,000
Stock Purchase Agreement with Venture Investor First Tranche |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Funding commitment |  |  |  |  |  |  |  |  |  |  | 5,000
Stock Purchase Agreement with Venture Investor Second Tranche |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Funding commitment |  |  |  |  |  |  |  |  |  |  | $ 5,000
Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  |  |  |  |  |  |  |  | 5,000,000 | 135,936,731 |
Temporary equity, par value | $ / shares |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |
Dividend rate percentage |  |  |  |  |  |  |  |  | 8.00% |  |
Dividends temperory stock |  |  |  |  |  |  |  |  | $ 0 | $ 0 |
Convertible Preferred Stock | Conversion of Preferred Stock into a share of Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued for convertible preferred stock | shares | 5,365,899 |  |  |  |  |  |  |  |  |  |
Common stock, conversion ratio | 0.0322% |  |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  |  |  |  |  |  |  |  |  | 17,000,000 |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  | $ 5,000 | $ 2,000 |  |  |  | $ 16,982 |
Temporary equity stock issued during period shares new issues | shares |  |  |  |  | 5,000,000 | 2,000,000 |  |  |  |  |
Series A Convertible Preferred Stock | Stock Purchase Agreement with Venture Investor First Tranche |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  | $ 2,399 |  |  |
Conversion of notes payable and accrued interest |  |  |  |  |  |  |  | $ 2,601 |  |  |
Temporary equity stock issued during period shares new issues | shares |  |  |  |  |  |  |  | 5,000,000 |  |  |
Converted instrument, amount |  |  |  |  |  |  |  | $ 2,601 |  |  |
Series A Convertible Preferred Stock | Stock Purchase Agreement with Venture Investor Second Tranche |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  | $ 5,000 |  |  |  |
Temporary equity stock issued during period shares new issues | shares |  |  |  |  |  |  | 5,000,000 |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  |  |  |  |  |  |  |  |  | 25,186,738 |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  | $ 24,943 |
Series B Convertible Preferred Stock | Conversion of Debt to Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of notes payable and accrued interest |  |  |  | $ 8,000 |  |  |  |  |  |  |
Debt instrument, convertible, number of equity instruments | shares |  |  |  | 25,186,738 |  |  |  |  |  |  |
Debt instrument, convertible, conversion price | $ / shares |  |  |  | $ 1.00 |  |  |  |  |  |  |
Converted instrument, amount |  |  |  | $ 8,000 |  |  |  |  |  |  |
Series B1 Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares authorized | shares |  |  |  |  |  |  |  |  |  | 93,749,993 |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  | $ 35,000 |  |  |  |  |  |  |  | $ 57,489 |
Temporary equity stock issued during period shares new issues | shares |  | 43,749,996 |  |  |  |  |  |  |  |  |
Sale of stock, price per share | $ / shares |  | $ 0.80 |  |  |  |  |  |  |  |  |
Series B1 Convertible Preferred Stock | Conversion of Debt to Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  | $ 23,000 |  |  |  |  |  |  |  |
Temporary equity stock issued during period shares new issues | shares |  |  | 28,749,997 |  |  |  |  |  |  |  |
Sale of stock, price per share | $ / shares |  |  | $ 0.80 |  |  |  |  |  |  |  |

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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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