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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Measurements |
Schedule of the Company's financial assets and financial liabilities measured at fair value on a recurring basis | The following tables present information about the Company’s financial assets measured at fair value on a recurring basis as of December 31, 2019 and December 31, 2018, and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value (in thousands). The Company did not have any financial liabilities measured at fair value on a recurring basis as of December 31, 2018.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2019 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Significant | ​ | ​ | ​ |
​ | ​ | ​ | ​ | ​ | Quoted prices in | ​ | other | ​ | Significant |
​ | ​ | ​ | ​ | ​ | active markets for | ​ | observable | ​ | unobservable |
​ | ​ | December 31, | ​ | identical assets | ​ | inputs | ​ | inputs |
​ | ​ | 2019 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) |
Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​
Money market funds (i) | ​ | $ | 2,530 | ​ | $ | 2,530 | ​ | $ | — | ​ | $ | — | ​
Bank certificates of deposit (ii)(iii) | ​ | ​ | 14,208 | ​ | ​ | — | ​ | ​ | 14,208 | ​ | ​ | — | ​
Commercial paper (ii) | ​ | ​ | 7,484 | ​ | ​ | — | ​ | ​ | 7,484 | ​ | ​ | — | ​
Corporate notes (ii) | ​ | ​ | 65,638 | ​ | ​ | — | ​ | ​ | 65,638 | ​ | ​ | — | ​
Asset-backed securities (ii) | ​ | ​ | 25,424 | ​ | ​ | — | ​ | ​ | 25,424 | ​ | ​ | — | ​
Total assets | ​ | $ | 115,284 | ​ | $ | 2,530 | ​ | $ | 112,754 | ​ | $ | — | ​
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash-settled stock options | ​ | $ | 6,685 | ​ | ​ | — | ​ | ​ | 6,685 | ​ | ​ | — | ​
Total liabilities | ​ | $ | 6,685 | ​ | $ | — | ​ | $ | 6,685 | ​ | $ | — | ​
(i) | Included in cash and cash equivalents with a maturity of three months or less from date of purchase on the consolidated balance sheets.
(ii) | Included in short-term investments on the consolidated balance sheets.
(iii) | One bank certificate of deposit investment totaling $1,201 (in thousands) is included in cash and cash equivalents on the consolidated balance sheets, as the investment has a maturity of three months or less from the date of purchase on the consolidated balance sheets.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | At December 31, 2018 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Significant | ​ | ​ | ​ |
​ | ​ | ​ | ​ | ​ | Quoted prices in | ​ | other | ​ | Significant |
​ | ​ | ​ | ​ | ​ | active markets for | ​ | observable | ​ | unobservable |
​ | ​ | December 31, | ​ | identical assets | ​ | inputs | ​ | inputs |
​ | ​ | 2018 | ​ | (Level 1) | ​ | (Level 2) | ​ | (Level 3) |
Assets |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  | ​
Money market funds (i) | ​ | $ | 1,156 | ​ | $ | 1,156 | ​ | $ | — | ​ | $ | — | ​
U.S. government agency bonds (ii) | ​ | ​ | 1,982 | ​ | ​ | — | ​ | ​ | 1,982 | ​ | ​ | — | ​
U.S. Government bonds (ii) | ​ | ​ | 1,297 | ​ | ​ | — | ​ | ​ | 1,297 | ​ | ​ | — | ​
Bank certificates of deposit (ii) | ​ | ​ | 15,201 | ​ | ​ | — | ​ | ​ | 15,201 | ​ | ​ | — | ​
Commercial paper (ii) | ​ | ​ | 9,593 | ​ | ​ | — | ​ | ​ | 9,593 | ​ | ​ | — | ​
Corporate notes (ii)(iii) | ​ | ​ | 61,752 | ​ | ​ | — | ​ | ​ | 61,752 | ​ | ​ | — | ​
Asset-backed securities (ii) | ​ | ​ | 21,842 | ​ | ​ | — | ​ | ​ | 21,842 | ​ | ​ | — | ​
Total assets | ​ | $ | 112,823 | ​ | $ | 1,156 | ​ | $ | 111,667 | ​ | $ | — | ​
(i) | Included in cash and cash equivalents with a maturity of three months or less from date of purchase on the consolidated balance sheets.
(ii) | Included in short-term investments on the consolidated balance sheets.
(iii) | One corporate note investment totaling $1,000 (in thousands) is included in cash and cash equivalents on the consolidated balance sheets, as the investment has a maturity of three months or less from the date of purchase on the consolidated balance sheets.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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