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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2022
Quarterly Financial Data |
Quarterly Financial Data | Note 18. Quarterly Financial Data (Unaudited) 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, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total revenues | ​ | $ | 52,302 | ​ | $ | 64,153 | ​ | $ | 60,464 | ​ | $ | 60,358
Gross margin | ​ | $ | 22,341 | ​ | $ | 28,838 | ​ | $ | 26,417 | ​ | $ | 26,277
Loss from operations | ​ | $ | (7,819) | ​ | $ | (5,247) | ​ | $ | (7,803) | ​ | $ | (11,035)
Net loss attributable to common stockholders | ​ | $ | (15,404) | ​ | $ | (11,177) | ​ | $ | (7,316) | ​ | $ | (11,436)
Net loss per share attributable to common stockholders - basic and diluted | ​ | $ | (0.31) | ​ | $ | (0.23) | ​ | $ | (0.15) | ​ | $ | (0.24)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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)
​ Earnings per basic and diluted shares are computed independently for each of the quarters presented based on basic and diluted shares outstanding per quarter and, therefore, may not sum to the totals for the periods shown.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI https://asc.fasb.org/topic&trid=2126967 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=126900988&loc=SL124452896-108306 + Details
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