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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Summary of Fair Value Measurements of Cash Equivalents, Available-for-Sale Securities and Free Share Liability | The fair value measurements of cash equivalents, available-for-sale securities and the free share liability are identified at the following levels within the fair value hierarchy (in thousands):
|  | December 31, 2018 |
|  | Fair Value Measurements |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 103,291 |  |  | $ | 103,291 |  |  | $ | — |  |  | $ | — |
Total |  |  | 103,291 |  |  |  | 103,291 |  |  |  | — |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  |  | 177,224 |  |  |  | — |  |  |  | 177,224 |  |  |  | — |
Corporate debt securities |  |  | 63,870 |  |  |  | — |  |  |  | 63,870 |  |  |  | — |
U.S. government-sponsored entity debt securities |  |  | 18,621 |  |  |  | — |  |  |  | 18,621 |  |  |  | — |
Total |  |  | 259,715 |  |  |  | — |  |  |  | 259,715 |  |  |  | — |
Total cash equivalents and marketable securities |  | $ | 363,006 |  |  | $ | 103,291 |  |  | $ | 259,715 |  |  |  | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Free share liability |  | $ | 154 |  |  |  | — |  |  |  | — |  |  | $ | 154 |
Total |  | $ | 154 |  |  |  | — |  |  |  | — |  |  | $ | 154 |
|  | December 31, 2017 |
|  | Fair Value Measurements |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 24,290 |  |  | $ | 24,290 |  |  | $ | — |  |  | $ | — |
Commercial paper securities |  |  | 4,595 |  |  |  | — |  |  |  | 4,595 |  |  |  | — |
Total |  |  | 28,885 |  |  |  | 24,290 |  |  |  | 4,595 |  |  |  | — |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper securities |  |  | 110,247 |  |  |  | — |  |  |  | 110,247 |  |  |  | — |
Corporate debt securities |  |  | 75,755 |  |  |  | — |  |  |  | 75,755 |  |  |  | — |
U.S. government-sponsored entity debt securities |  |  | 8,492 |  |  |  | — |  |  |  | 8,492 |  |  |  | — |
Total |  |  | 194,494 |  |  |  | — |  |  |  | 194,494 |  |  |  | — |
Total cash equivalents and marketable securities |  | $ | 223,379 |  |  | $ | 24,290 |  |  | $ | 199,089 |  |  | $ | - |
Summary of Estimated Fair Value of Free Share Liability Assumptions | The assumptions used in this simulation model are reviewed each reporting period and adjusted, as needed, with any change in estimated fair value recorded on the Company’s consolidated statements of operations.
Free Shares Liability assumptions: |  | December 31, 2018 |
Sangamo Stock Price (USD) |  | 11.48 |
TxCell Stock Price (EUR) |  | 2.58 |
EUR/ USD Exchange Rate |  | 0.873 |
Sangamo Stock Price (USD) Volatility Estimate |  | 79.90% |
TxCell Stock Price (EUR) Volatility Estimate |  | 8.59% |
EUR/ USD Exchange Rate Volatility Estimate |  | 7.66% |
Risk Free Rate |  | Varies by expected exercise date |

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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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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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