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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Data |
Quarterly Financial Data | Note 19. 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, 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)
​ 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. In the fourth quarter of 2019, management identified an error in the Company's historical interim financial statements for the third quarter of fiscal year 2019 relating to its stock-based compensation expense. Specifically, in the third quarter of 2019, the Company incorrectly recorded $1,227,890 of accelerated stock-based compensation expense for nonemployee directors who were not eligible for the accelerated vesting under their stock option awards. The error impacts only the previously issued historical interim financial statements for the third quarter of fiscal year 2019. The Company corrected the error in the fourth quarter of 2019, which resulted in a reduction of $765,099 of stock-based compensation expense included in selling, general and administrative expense. The Company concluded the error is not material to the third and fourth quarter of 2019.

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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 http://asc.fasb.org/topic&trid=2126967 + Details
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