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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Fair Value Hierarchy | The following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value (in thousands):
|  | Fair Value at March 31, 2019 |  |  | Fair Value at December 31, 2018 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 49,113 |  |  | $ | ― |  |  | $ | ― |  |  | $ | 39,168 |  |  | $ | ― |  |  | $ | ― |
Asset-backed securities(2) |  |  | ― |  |  |  | 15,000 |  |  |  | ― |  |  |  | ― |  |  |  | 19,997 |  |  |  | ― |
Corporate debt securities(3) |  |  | ― |  |  |  | 26,712 |  |  |  | ― |  |  |  | ― |  |  |  | 26,219 |  |  |  | ― |
Total assets |  | $ | 49,113 |  |  | $ | 41,712 |  |  | $ | ― |  |  | $ | 39,168 |  |  | $ | 46,216 |  |  | $ | ― |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes payable |  | $ | ― |  |  | $ | 117,267 |  |  | $ | ― |  |  | $ | ― |  |  | $ | 197,935 |  |  | $ | ― |
| (1) | Classified as cash and cash equivalents as of March 31, 2019 and December 31, 2018, respectively, on the consolidated balance sheets.
| (2) | Includes $15,000 classified as cash and cash equivalents as of both March 31, 2019 and December 31, 2018 on the consolidated balance sheets.
| (3) | Includes $24,228 and $9,236 classified as cash and cash equivalents as of March 31, 2019 and December 31, 2018, respectively, on the consolidated balance sheet.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + 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=99377789&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 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 3: 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=99377789&loc=d3e19207-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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