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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2020
Fair Value Measurements |
Schedule of fair value of assets measured at fair value on a recurring basis, by level of fair value hierarchy | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2020
​ | ​ | Fair Value Measured Using | ​ | Total
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Balance
Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents | ​ | $ | 19,834 | ​ | $ | — | ​ | $ | — | ​ | $ | 19,834
Marketable securities | ​ |  | 3,029 | ​ |  | 35,524 | ​ |  | — | ​ |  | 38,553
​ | ​ | $ | 22,863 | ​ | $ | 35,524 | ​ | $ | — | ​ | $ | 58,387
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ | ​ | Fair Value Measured Using | ​ | Total
​ |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Balance
Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Cash equivalents | ​ | $ | 4,252 | ​ | $ | — | ​ | $ | — | ​ | $ | 4,252
Marketable securities | ​ | ​ | 7,023 | ​ |  | 65,805 | ​ |  | — | ​ |  | 72,828
​ | ​ | $ | 11,275 | ​ | $ | 65,805 | ​ | $ | — | ​ | $ | 77,080
Schedule of fair value of available for sale marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2020
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
U.S. Treasury securities | ​ | $ | 3,025 | ​ | $ | 4 | ​ | $ | — | ​ | $ | 3,029
U.S. Government agency securities | ​ | ​ | 24,481 | ​ | ​ | 24 | ​ | ​ | (2) | ​ | ​ | 24,503
Corporate debt obligations | ​ | ​ | 10,994 | ​ | ​ | 27 | ​ | ​ | — | ​ | ​ | 11,021
​ | ​ | $ | 38,500 | ​ | $ | 55 | ​ | $ | (2) | ​ | $ | 38,553
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
U.S. Treasury securities | ​ | $ | 7,019 | ​ | $ | 4 | ​ | $ | — | ​ | $ | 7,023
U.S. Government agency securities | ​ | ​ | 17,701 | ​ | ​ | 16 | ​ | ​ | — | ​ | ​ | 17,717
Corporate debt obligations | ​ | ​ | 48,079 | ​ | ​ | 17 | ​ | ​ | (8) | ​ | ​ | 48,088
​ | ​ | $ | 72,799 | ​ | $ | 37 | ​ | $ | (8) | ​ | $ | 72,828

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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