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Investments and Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments and Fair Value Measurements |
Cash, cash equivalents and investments | As of June 30, 2024 and December 31, 2023, our cash and debt investments are classified as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024 | ​ | December 31, 2023 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
​ |  | Cost |  | Gain |  | (Loss) |  | Value |  | Cost |  | Gain |  | (Loss) |  | Value |
Classified as: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and restricted cash | ​ | $ | 41,597 | ​ | $ | — | ​ | $ | — | ​ | $ | 41,597 | ​ | $ | 50,114 | ​ | $ | — | ​ | $ | — | ​ | $ | 50,114 | ​
Investments (available-for-sale): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit 1 | ​ |  | 1,680 | ​ |  | — | ​ | ​ | (5) | ​ |  | 1,675 | ​ |  | 2,160 | ​ |  | — | ​ | ​ | (20) | ​ |  | 2,140 | ​
Total cash, restricted cash and investments | ​ | $ | 43,277 | ​ | $ | — | ​ | $ | (5) | ​ | $ | 43,272 | ​ | $ | 52,274 | ​ | $ | — | ​ | $ | (20) | ​ | $ | 52,254 | ​
Contractual maturities on investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due within 1 year 2 | ​ | $ | 1,680 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 1,675 | ​ | $ | 2,160 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 2,140 | ​
​ | ​ | $ | 1,680 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 1,675 | ​ | $ | 2,160 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 2,140 | ​
1. | Certificates of deposit with original maturities of more than three months.
2. | Classified as “Short-term investments” in our condensed consolidated balance sheets.
Fair value and gross unrealized losses related to available-for-sale securities | The following table summarizes the fair value and gross unrealized losses related to available-for-sale debt securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of June 30, 2024 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | In Loss Position | ​ | In Loss Position | ​ | Total In |
​ | ​ | < 12 months | ​ | > 12 months | ​ | Loss Position |
​ | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | ​ | Gross |
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized |
As of June 30, 2024 |  | Value |  | (Losses) |  | Value |  | (Losses) |  | Value |  | (Losses) |
Investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | — | ​ | $ | — | ​ | $ | 1,675 | ​ | $ | (5) | ​ | $ | 1,675 | ​ | $ | (5) | ​
Total in loss position | ​ | $ | — | ​ | $ | — | ​ | $ | 1,675 | ​ | $ | (5) | ​ | $ | 1,675 | ​ | $ | (5) | ​
​ The following table summarizes the fair value and gross unrealized losses related to available-for-sale debt securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2023 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | In Loss Position | ​ | In Loss Position | ​ | Total In |
​ | ​ | < 12 months | ​ | > 12 months | ​ | Loss Position |
​ |  |  | ​ |  | Gross |  |  | ​ |  | Gross |  |  | ​ |  | Gross |
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized |
As of December 31, 2023 | ​ | Value | ​ | (Loss) | ​ | Value | ​ | (Loss) | ​ | Value | ​ | (Loss) |
Investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | — | ​ | $ | — | ​ | $ | 2,140 | ​ | $ | (20) | ​ | $ | 2,140 | ​ | $ | (20) | ​
Total in loss position | ​ | $ | — | ​ | $ | — | ​ | $ | 2,140 | ​ | $ | (20) | ​ | $ | 2,140 | ​ | $ | (20) | ​
Summary of financial assets and liabilities measured at fair value on a recurring basis | The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis in accordance with ASC 820 as of June 30, 2024 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Quoted Prices in |  | ​ | ​ | ​ | Significant |
​ | ​ | ​ | ​ | ​ | Active Markets of | ​ | Significant Other | ​ | Unobservable |
​ | ​ | Balance as of | ​ | Identical Assets | ​ | Observable Inputs | ​ | Inputs |
​ |  | June 30, 2024 |  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | 1,675 | ​ | $ | — | ​ | $ | 1,675 | ​ | $ | — | ​
Total | ​ | $ | 1,675 | ​ | $ | — | ​ | $ | 1,675 | ​ | $ | — | ​
​ The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis in accordance with ASC 820 as of December 31, 2023 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Quoted Prices in |  | ​ | ​ | ​ | Significant |
​ | ​ | ​ | ​ | ​ | Active Markets of | ​ | Significant Other | ​ | Unobservable |
​ | ​ | Balance as of | ​ | Identical Assets | ​ | Observable Inputs | ​ | Inputs |
​ |  | December 31, 2023 |  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | 2,140 | ​ | $ | — | ​ | $ | 2,140 | ​ | $ | — | ​
Total | ​ | $ | 2,140 | ​ | $ | — | ​ | $ | 2,140 | ​ | $ | — | ​
​

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