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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

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, 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	$	91,936			$	91,936			$	—			$	—
U.S. Treasury securities	1,994				—				1,994				—
Government-sponsored enterprises	3,441				—				3,441				—
Corporate debt securities	60,065				—				60,065				—
Common stock warrants	6,130				—				—				6,130
Total assets measured at fair value(a)	$	163,566			$	91,936			$	65,500			$	6,130

(a) Total assets measured at fair value at June 30, 2018 includes approximately $95.2 million reported in cash and cash equivalents and $6.1 million reported in other assets on the balance sheet.

	Fair Value Measurements at December 31, 2017
					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	$	61,512			$	61,512			$	—			$	—
U.S. Treasury securities	3,990				—				3,990				—
Government-sponsored enterprises	11,990				—				11,990				—
Corporate debt securities	78,418				—				78,418				—
Total assets measured at fair value(a)	$	155,910			$	61,512			$	94,398			$	—

(a) Total assets measured at fair value at December 31, 2017 includes approximately $62.5 million reported in cash and cash equivalents 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

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- References

No definition available.

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