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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Basis of Presentation and Summary of Significant Accounting Policies |
Schedule of cash and cash equivalent and restricted cash | The following table summarizes cash and cash equivalent and restricted cash in the consolidated balance sheets (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Cash and cash equivalents | ​ | $ | 90,626 | ​ | $ | 58,524
Restricted | ​ |  | 15,500 | ​ |  | 15,500
​ | ​ | $ | 106,126 | ​ | $ | 74,024
Schedule of allowance for doubtful accounts | The change in the Company’s allowance for doubtful accounts was as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Beginning balance | ​ | $ | 1,122 | ​ | $ | 1,055 | ​ | $ | 640
Additions | ​ |  | 1,208 | ​ |  | 449 | ​ |  | 482
Write-offs, net of recoveries | ​ |  | (943) | ​ |  | (382) | ​ |  | (67)
Ending balance | ​ | $ | 1,387 | ​ | $ | 1,122 | ​ | $ | 1,055
Schedule of stock-based compensation | The following table summarizes stock-based compensation cost included in the consolidated statements of operations (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Cost of revenue, excluding depreciation and amortization | ​ | $ | 109 | ​ | $ | 353 | ​ | $ | 1,436
Sales and marketing | ​ |  | 60 | ​ |  | 658 | ​ |  | 1,442
General and administrative | ​ |  | 977 | ​ |  | 1,446 | ​ |  | 1,505
Research and development | ​ |  | 43 | ​ |  | 356 | ​ |  | 637
​ | ​ | $ | 1,189 | ​ | $ | 2,813 | ​ | $ | 5,020

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