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Revenue - Summary of Sales from Contracts with Customers Disaggregated by Categories (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 5,240 | $ 3,441 | $ 14,751 | $ 10,133
Fixed-price [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 495 | 163 | 1,536 | 267
Cost-plus [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 3,845 | 2,566 | 10,956 | 8,213
Time and Material [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 900 | 712 | 2,259 | 1,653
Related Party [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | 4,235 | 2,672 | 12,206 | 8,394
Commercial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenue | $ 1,005 | $ 769 | $ 2,545 | $ 1,739

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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