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Summary of Significant Accounting Policies - Revenue Recognition - Accounts receivable, net (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts receivable, net |  |
Trade accounts receivable | $ 5,408,000 | $ 4,188,000
Unbilled accounts receivable | 289,000 |
Allowance for accounts receivable | 600,000 | 147,000
Accounts receivable, net | 5,097,000 | 4,041,000
Non-distributor |  |
Accounts receivable, net |  |
Allowance for accounts receivable | 238,000 | 147,000
Distributor |  |
Accounts receivable, net |  |
Allowance for accounts receivable | $ 362,000 | $ 0

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