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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies |
Schedule of cash and cash equivalents and restricted cash | The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets that equate to the amount reported in the consolidated statement of cash flows as of December 31, 2019, December 31, 2018 and December 31, 2017 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended
​ | ​ | ​ | December 31,
​ | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2017 | ​
Cash and cash equivalents | ​ | $ | 62,430 | ​ | $ | 29,821 | ​ | $ | 24,508 | ​
Restricted cash | ​ | ​ | 9,326 | ​ | ​ | 8,775 | ​ | ​ | — | ​
Cash, cash equivalents and restricted cash in the consolidated statement of cash flows | ​ | $ | 71,756 | ​ | $ | 38,596 | ​ | $ | 24,508 | ​
​
Schedule of the Company's net loss per share | The Company’s computation of net income (loss) per share is as follows (in thousands, except per share amounts):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | As of | ​
​ | ​ | ​ | ​ | ​ | December 31, | ​
​ | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2017 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income (loss) - basic | ​ | $ | 15,424 | ​ | $ | (12,951) | ​ | $ | (92) | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average number of common shares outstanding - basic | ​ | ​ | 37,355 | ​ | ​ | 35,317 | ​ | ​ | 34,381 | ​
Common stock equivalents from outstanding common stock options | ​ | ​ | 3,495 | ​ | ​ | - | ​ | ​ | - | ​
Common stock equivalents for ESPP | ​ | ​ | 25 | ​ | ​ | - | ​ | ​ | - | ​
Common stock equivalents from unvested restricted stock units | ​ | ​ | 270 | ​ | ​ | - | ​ | ​ | - | ​
Weighted average number of common shares outstanding - diluted | ​ | ​ | 41,145 | ​ | ​ | 35,317 | ​ | ​ | 34,381 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic net income (loss) per share | ​ | $ | 0.41 | ​ | $ | (0.37) | ​ | $ | (0.00) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income (loss) per share | ​ | $ | 0.37 | ​ | $ | (0.37) | ​ | $ | (0.00) | ​
Schedule of potentially dilutive securities not included in the calculation of diluted net loss per share attributable to common stockholders | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | As of |
​ | ​ | ​ | December 31, |
​ | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2017 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Stock options outstanding |  | ​ | 3,616 |  | ​ | 5,614 |  | ​ | 5,516 | ​
Unvested restricted stock units | ​ | ​ | 365 | ​ | ​ | 244 | ​ | ​ | 173 | ​
Employee stock purchase plan | ​ | ​ | 26 |  | ​ | 3 |  | ​ | 28 | ​
​ | ​ | ​ | 4,007 |  | ​ | 5,861 |  | ​ | 5,717 | ​

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