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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2021
Summary of Significant Accounting Policies |
Schedule of anti-dilutive common stock equivalents excluded from calculation of diluted net loss per share | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Three and Six Months Ended June 30,
​ |  | 2021 |  | 2020
Series X Preferred Stock (1) | ​ | 32,545,203 | ​ | —
Stock options |  | 7,930,334 |  | 1,301,262
Common stock warrants |  | 9,183,885 |  | 6,193,749
​ |  | 49,659,422 | ​ | 7,495,011
(1) Shown as common stock equivalents
Schedule of reconciliation of cash, cash equivalents and restricted cash | The reconciliation of cash, cash equivalents and restricted cash reported within the applicable balance sheet that sum to the total of the same such amount shown in the statement of cash flows is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ |  | 2021 |  | 2020
Cash and cash equivalents | ​ | $ | 139,520 | ​ | $ | 51,885
Restricted cash (1) | ​ | ​ | 121 | ​ | ​ | 235
Total | ​ | $ | 139,641 | ​ | $ | 52,120
(1) Included in prepaid expenses and other current assets and other assets. ​

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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