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Company and Summary of Significant Accounting Policies - Accounts Receivable and Concentration of Credit Risk (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Concentration Risk [Line Items] |  |  |
Accounts receivable, before allowance for credit loss | $ 6,114,296 |  | $ 5,148,213
Unbilled receivables | 18,653 |  | 58,992
Allowance for doubtful accounts receivable | $ 155,000 |  | $ 155,000
Accounts Receivable [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, customer | two |  |
Accounts Receivable [Member] | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 31.00% |  |
Revenue Benchmark |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, customer | one | no |
Revenue Benchmark | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 11.00% |  |

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- Definition Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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