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Summary of Significant Accounting Policies - Accounts Receivable, net (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Accounts receivable |  |
Allowance for product returns | $ 170,000 | $ 144,000
Allowance for price concessions |  | 569,000
Trade accounts receivable | 5,261,000 | 7,297,000
Unbilled accounts receivable | 477,000 | 938,000
Allowance for accounts receivable | (170,000) | (713,000)
Accounts receivable, net | $ 5,568,000 | $ 7,522,000

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