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Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2019

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 the Company’s cash equivalents, available-for-sale securities and the free share asset/liability are identified at the following levels within the fair value hierarchy (in thousands):

			December 31, 2019
			Fair Value Measurement
			Total						Level 1						Level 2						Level 3
Assets:
Cash equivalents:
Money market funds			$	30,496					$	30,496					$	—					$	—
Commercial paper securities			2,999						—						2,999						—
Total			33,495						30,496						2,999						—
Marketable securities:
Commercial paper securities			155,368						—						155,368						—
Corporate debt securities			95,017						—						95,017						—
U.S. government-sponsored entity debt securities			53,493						—						53,493						—
Total			303,878						—						303,878						—
Total cash equivalents and marketable securities			$	337,373					$	30,496					$	306,877					$	—
Free shares asset			$	236					$	—					$	—					$	236

			December 31, 2018
			Fair Value Measurement
			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 shares liability			$	154					$	—					$	—					$	154

Summary of Estimated Fair Value of Free Share Liability Assumptions

			December 31,
Free Shares valuation assumptions:			2019						2018
Sangamo Stock Price (USD)			$	8.68					$	11.48
Sangamo France Stock Price (EUR)			€	2.14					€	2.58
USD/ EUR Exchange Rate			0.91						0.87
Estimated Correlation Sangamo and Sangamo France Stock Prices			100.0		%				—
Sangamo Stock Price (USD) Volatility Estimate			72.5		%				79.9		%
Sangamo France Stock Price (EUR) Volatility Estimate			72.5		%				8.6		%
USD/ EUR Exchange Rate Volatility Estimate			6.6		%				7.7		%
Risk Free Rate and Cost of Debt by Expected Exercise Date			Varies						Varies

X

- 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

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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

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