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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2021
Quarterly Financial Data |
Schedule of quarterly financial information | A summary of quarterly financial data is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quarter Ended
​ |  | March 31 |  | June 30 |  | September 30 |  | December 31
Year ended December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total revenues | ​ | $ | 53,284 | ​ | $ | 56,191 | ​ | $ | 56,693 | ​ | $ | 56,440
Gross margin | ​ | $ | 24,550 | ​ | $ | 25,402 | ​ | $ | 23,513 | ​ | $ | 23,113
Loss from operations | ​ | $ | (1,142) | ​ | $ | (3,748) | ​ | $ | (4,576) | ​ | $ | (8,362)
Net loss attributable to common stockholders | ​ | $ | (5,723) | ​ | $ | (7,389) | ​ | $ | (8,526) | ​ | $ | (262,086)
Net loss per share attributable to common stockholders - basic and diluted | ​ | $ | (0.13) | ​ | $ | (0.16) | ​ | $ | (0.18) | ​ | $ | (5.46)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Total revenues | ​ | $ | 9,774 | ​ | $ | 9,389 | ​ | $ | 11,172 | ​ | $ | 48,361
Gross margin | ​ | $ | 5,258 | ​ | $ | 5,127 | ​ | $ | 6,055 | ​ | $ | 19,894
Loss from operations | ​ | $ | (3,586) | ​ | $ | (5,845) | ​ | $ | (10,732) | ​ | $ | (9,847)
Net loss attributable to common stockholders | ​ | $ | (3,943) | ​ | $ | (5,803) | ​ | $ | (11,418) | ​ | $ | (53,866)
Net loss per share attributable to common stockholders - basic and diluted | ​ | $ | (0.11) | ​ | $ | (0.15) | ​ | $ | (0.29) | ​ | $ | (1.32)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Total revenues | ​ | $ | 6,653 | ​ | $ | 8,464 | ​ | $ | 9,583 | ​ | $ | 9,242
Gross margin | ​ | $ | 3,454 | ​ | $ | 4,338 | ​ | $ | 4,627 | ​ | $ | 4,932
Loss from operations | ​ | $ | (2,141) | ​ | $ | (2,304) | ​ | $ | (12,352) | ​ | $ | (878)
Net loss | ​ | $ | (2,387) | ​ | $ | (2,528) | ​ | $ | (12,469) | ​ | $ | (948)
Net loss per share - basic and diluted | ​ | $ | (0.08) | ​ | $ | (0.08) | ​ | $ | (0.35) | ​ | $ | (0.03)

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124502072&loc=d3e1280-108306 + Details
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