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Investments and Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2022
Investments and Fair Value Measurements |
Cash, cash equivalents and investments | As of March 31, 2022 and December 31, 2021, our cash, cash equivalents and debt investments are classified as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022 | ​ | December 31, 2021 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
​ |  | Cost |  | Gain |  | (Loss) |  | Value |  | Cost |  | Gain |  | (Loss) |  | Value |
Classified as: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash | ​ | $ | 29,494 | ​ | $ | — | ​ | $ | — | ​ | $ | 29,494 | ​ | $ | 36,763 | ​ | $ | — | ​ | $ | — | ​ | $ | 36,763 | ​
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit 1 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Total cash and cash equivalents | ​ |  | 29,494 | ​ |  | — | ​ |  | — | ​ |  | 29,494 | ​ |  | 36,763 | ​ |  | — | ​ |  | — | ​ |  | 36,763 | ​
Investments (available-for-sale): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit 2 | ​ |  | 6,680 | ​ |  | — | ​ | ​ | (90) | ​ |  | 6,590 | ​ |  | 6,680 | ​ |  | — | ​ | ​ | (19) | ​ |  | 6,661 | ​
Corporate bonds | ​ |  | 8,357 | ​ |  | — | ​ |  | (147) | ​ |  | 8,210 | ​ |  | 8,380 | ​ |  | — | ​ |  | (46) | ​ |  | 8,334 | ​
Total investments | ​ |  | 15,037 | ​ |  | — | ​ |  | (237) | ​ |  | 14,800 | ​ |  | 15,060 | ​ |  | — | ​ |  | (65) | ​ |  | 14,995 | ​
Total cash, cash equivalents and investments | ​ | $ | 44,531 | ​ | $ | — | ​ | $ | (237) | ​ | $ | 44,294 | ​ | $ | 51,823 | ​ | $ | — | ​ | $ | (65) | ​ | $ | 51,758 | ​
Contractual maturities on investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due within 1 year 3 | ​ | $ | 5,409 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 5,400 | ​ | $ | 5,424 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 5,419 | ​
Due after 1 through 5 years 4 | ​ |  | 9,627 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 9,400 | ​ |  | 9,636 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 9,576 | ​
​ | ​ | $ | 15,036 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 14,800 | ​ | $ | 15,060 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 14,995 | ​
1. | Certificates of deposit with original maturities of less than three months.
2. | Certificates of deposit with original maturities of more than three months.
3. | Classified as “Short-term investments” in our condensed consolidated balance sheets.
4. | Classified as “Long-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 March 31, 2022 (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 March 31, 2022 |  | Value |  | (Losses) |  | Value |  | (Losses) |  | Value |  | (Losses) |
Investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | 6,590 | ​ | $ | (90) | ​ | $ | — | ​ | $ | — | ​ | $ | 6,590 | ​ | $ | (90) | ​
Corporate bonds | ​ |  | 4,857 | ​ |  | (139) | ​ |  | 3,002 | ​ |  | (7) | ​ |  | 7,859 | ​ | ​ | (146) | ​
Total in loss position | ​ | $ | 11,447 | ​ | $ | (229) | ​ | $ | 3,002 | ​ | $ | (7) | ​ | $ | 14,449 | ​ | $ | (236) | ​
​ ​ 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, 2021 (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, 2021 | ​ | Value | ​ | (Loss) | ​ | Value | ​ | (Loss) | ​ | Value | ​ | (Loss) |
Investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | 6,181 | ​ | $ | (19) | ​ | $ | — | ​ | $ | — | ​ | $ | 6,181 | ​ | $ | (19) | ​
Corporate bonds | ​ |  | 5,970 | ​ |  | (42) | ​ |  | 2,013 | ​ |  | (4) | ​ |  | 7,983 | ​ | ​ | (46) | ​
Total in loss position | ​ | $ | 12,151 | ​ | $ | (61) | ​ | $ | 2,013 | ​ | $ | (4) | ​ | $ | 14,164 | ​ | $ | (65) | ​
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 Mach 31, 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Quoted Prices in |  | ​ | ​ | ​ | Significant |
​ | ​ | ​ | ​ | ​ | Active Markets of | ​ | Significant Other | ​ | Unobservable |
​ | ​ | Balance as of | ​ | Identical Assets | ​ | Observable Inputs | ​ | Inputs |
​ |  | March 31, 2022 |  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents and investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | 6,590 | ​ | $ | — | ​ | $ | 6,590 | ​ | $ | — | ​
Corporate bonds | ​ |  | 8,210 | ​ |  | — | ​ |  | 8,210 | ​ |  | — | ​
Total | ​ | $ | 14,800 | ​ | $ | — | ​ | $ | 14,800 | ​ | $ | — | ​
​ 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, 2021 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Quoted Prices in |  | ​ | ​ | ​ | Significant |
​ | ​ | ​ | ​ | ​ | Active Markets of | ​ | Significant Other | ​ | Unobservable |
​ | ​ | Balance as of | ​ | Identical Assets | ​ | Observable Inputs | ​ | Inputs |
​ |  | December 31, 2021 |  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents and investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Certificates of deposit | ​ | $ | 6,661 | ​ | $ | — | ​ | $ | 6,661 | ​ | $ | — | ​
Corporate bonds | ​ |  | 8,334 | ​ |  | — | ​ |  | 8,334 | ​ |  | — | ​
Total | ​ | $ | 14,995 | ​ | $ | — | ​ | $ | 14,995 | ​ | $ | — | ​
​

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