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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Financial Assets Measured at Fair Value on a Recurring Basis | Financial assets measured at fair value on a recurring basis were as follows (in thousands):
| Fair Value Measurements at June 30, 2019 |  |  |  |  |  |
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Money market funds | $ | 55,663 |  | $ | 55,663 |  | $ | — |  | $ | —
Government-sponsored enterprises | 20,927 |  | — |  | 20,927 |  | —
Corporate debt securities | 84,356 |  | — |  | 84,356 |  | —
Common stock warrants | 22,356 |  | — |  | — |  | 22,356
Total assets measured at fair value(a) | $ | 183,302 |  | $ | 55,663 |  | $ | 105,283 |  | $ | 22,356
| Fair Value Measurements at December 31, 2018 |  |  |  |  |  |
|  |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
| Total |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Money market funds | $ | 46,257 |  | $ | 46,257 |  | $ | — |  | $ | —
U.S. Treasury securities | 12,488 |  | — |  | 12,488 |  | —
Corporate debt securities | 100,214 |  | — |  | 100,214 |  | —
Common stock warrants | 1,890 |  | — |  | — |  | 1,890
Total assets measured at fair value(b) | $ | 160,849 |  | $ | 46,257 |  | $ | 112,702 |  | $ | 1,890
(a) Total assets measured at fair value at June 30, 2019 includes approximately $69.1 million reported in cash and cash equivalents and $22.4 million reported in other assets on the balance sheet. (b) Total assets measured at fair value at December 31, 2018 includes approximately $146.2 million reported in cash and cash equivalents on the balance sheet and $1.9 million reported in other assets on the balance sheet.

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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=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 3 -URI http://asc.fasb.org/extlink&oid=99377789&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=99377789&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 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 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 (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 6: 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=99377789&loc=d3e19207-110258 + Details
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