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Investment - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 27, 2019 | Jun. 20, 2017 | Jun. 30, 2020 | Dec. 31, 2019
Investment [Line Items] |  |  |  |
Carrying value of investments |  |  | $ 11,192 | $ 11,192
Thesys Group, Inc [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Carrying value of investments |  |  | $ 3,080 | 3,080
Thesys Group, Inc [Member] | Convertible Preferred Stock [Member] | Series Y Preferred Stock [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Number of shares issued |  | 7,797,533 |  |
Current fully diluted ownership percentage |  | 19.00% |  |
Liquidation preference |  | $ 0.231 |  |
Thesys Group, Inc [Member] | Warrant [Member] | Series Y Preferred Stock [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Warrants to purchase shares |  | 3,898,766 |  |
Exercisable percentage of warrant if claim brought against Company |  | 100.00% |  |
Securrency Inc [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Ownership interest percentage |  |  | 25.00% |
Original fully diluted ownership interest percentage |  |  | 20.00% |
Percentage of voting approval required to redeem all of the outstanding Series A preferred |  |  | 60.00% |
Securrency Inc [Member] | Convertible Preferred Stock [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Carrying value of investments | $ 8,112 |  | $ 8,112 | $ 8,112
Number of shares purchased | 5,178,488 |  |  |
Non-cumulative dividend | 6.00% |  |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 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(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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