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v3.20.2

Liquidity and Management Plans - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Liquidity And Management Plans [Line Items] |  |  |  |  |  |  |  |
Engineering product development |  | $ 114,375 |  |  | $ 47,500 |  | $ 175,850 | $ 114,000
Net loss |  | (8,204,666) | $ (8,597,736) |  | (9,803,996) | $ (11,019,468) | (16,802,402) | (20,823,464)
Net cash provided by (used in) operating activities |  |  |  |  |  |  | (13,215,844) | (14,423,911)
Proceeds of securities offerings | $ 23,319,156 | 9,216,611 | $ 5,506,880 | $ 4,557,693 |  |  | 14,723,491 | 23,319,156
Cash and cash equivalents, at carrying value, total |  | 23,408,940 |  | $ 21,684,089 |  |  | 23,408,940 |
Technology Service [Member] |  |  |  |  |  |  |  |
Liquidity And Management Plans [Line Items] |  |  |  |  |  |  |  |
Engineering product development |  | $ 114,375 |  |  | $ 47,500 |  | $ 175,850 | $ 114,000

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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