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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2021
Summary of Significant Accounting Policies |
Schedule of accounts receivable net | Accounts receivable, net consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ | ​ | 2021 | ​ | 2020
Trade accounts receivable | ​ | $ | 9,240 | ​ | $ | 7,590
Unbilled accounts receivable | ​ | ​ | 1,308 | ​ | ​ | 255
Allowance for product returns and price concessions | ​ |  | (233) | ​ |  | (238)
Accounts receivable, net | ​ | $ | 10,315 | ​ | $ | 7,607
Schedule of revenue and accounts receivable for each significant customer | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Revenue | ​ | Accounts Receivable, net |  | ​
​ | ​ | Three Months Ended | ​ | ​ | As of |  | ​
​ | ​ | March 31, | ​ | ​ | March 31, | ​ | December 31, | ​ | ​
Customers |  | 2021 |  | 2020 |  | ​ | 2021 |  | 2020 |  | ​
Customer A |  | * | ​ | 22 | % | ​ | 16 | % | 29 | % | ​
Customer B |  | 27 | % | 12 | % | ​ | 39 | % | 25 | % | ​
Customer C | ​ | * | ​ | 11 | % | ​ | * | ​ | * | ​ | ​
Customer D | ​ | * | ​ | 11 | % | ​ | * | ​ | * | ​ | ​
* | Less than 10%
Schedule of fair value of financial assets and liabilities measured on recurring basis | The following tables sets forth the fair value of the Company’s financial assets and liabilities measured at fair value on a recurring basis (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Money market funds | ​ | $ | 15,820 |  | $ | — |  | $ | — |  | $ | 15,820
Total assets measured at fair value | ​ | $ | 15,820 |  | $ | — |  | $ | — |  | $ | 15,820
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Warrant liability | ​ | $ | — |  | $ | — |  | $ | 36 |  | $ | 36
Total liabilities measured at fair value | ​ | $ | — |  | $ | — |  | $ | 36 |  | $ | 36
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Money market funds | ​ | $ | 14,669 |  | $ | — |  | $ | — |  | $ | 14,669
Total assets measured at fair value | ​ | $ | 14,669 |  | $ | — |  | $ | — |  | $ | 14,669
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: | ​ | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Warrant liability | ​ | $ | — |  | $ | — |  | $ | 31 |  | $ | 31
Total liabilities measured at fair value | ​ | $ | — |  | $ | — |  | $ | 31 |  | $ | 31

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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