XML 63 R38.htm IDEA: XBRL DOCUMENT v3.19.1

Equity-based Compensation and Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Restricted Common Stock Activity

The following table shows restricted common stock activity:

		Restricted stock awards
						Weighted average grant date
		Number of				fair value
		shares				(per share)
Unvested at December 31, 2016			—			$	—
Awards exchanged upon 2017 Reorganization			1,059,912				13.53
Granted			2,884				19.01
Vested			(671,204	)			13.54
Forfeited			(16,113	)			13.53
Unvested at December 31, 2017			375,479			$	13.55
Granted			—				—
Vested			(186,332	)			13.54
Forfeited			(70,468	)			13.61
Unvested at December 31, 2018			118,679			$	13.54

Schedule of Equity-based Compensation Expenses

The following table summarizes equity‑based compensation expense within the Company’s consolidated statements of operations and comprehensive loss for the years ended December 31, 2018 and 2017 (in thousands):

		Years ended December 31,
		2018				2017
Research and development		$	1,333			$	1,410
General and administrative			2,984				1,242
		$	4,317			$	2,652

Schedule of Equity-based Compensation Expenses by Award Type

The following table summarizes equity‑based compensation expense by type of award for the years ended December 31, 2018 and 2017 (in thousands):

		Years ended December 31,
		2018				2017
Stock options		$	3,361			$	1,956
Restricted stock awards			956				508
Incentive units			—				132
Restricted common units			—				56
		$	4,317			$	2,652

Restricted Common Units

Schedule of Restricted Common Unit Activity

The following table shows the restricted common unit activity for the year ended December 31, 2017, prior to the 2017 Reorganization, as adjusted for the Merger:

		Restricted common units
						Grant date
		Number of				fair value
		units				(per unit)
Unvested at December 31, 2016			219,087			$	1.48
Granted			—				—
Vested			(37,770	)			1.48
Forfeited			—				—
Exchanged as part of 2017 Reorganization			(181,317	)			1.48
Unvested at December 31, 2017			—			$	—

2015 and 2017 Plan

Schedule of Weighted Average Assumption Used Black-Scholes Option-pricing Model for Stock Options Issued to Employees and Nonemployees

The weighted average assumptions used in the Black-Scholes option-pricing model for stock options issued to employees under its two active equity plans, the 2015 Plan and the 2017 Plan, during the years ended December 31, 2018 and 2017 and to nonemployees during the year ended December 31, 2017 were:

		Year ended December 31,
Employees:		2018				2017
Expected term		6.2 years				6.2 years
Weighted-average, risk-free interest rate			2.8	%			2.1	%
Expected volatility			70.8	%			70.4	%
Dividend yield			—				—

Schedule of Stock Option Activity

The following table summarizes stock option activity, as adjusted for the Exchange Ratio under the 2015 and 2017 Plans.

		Stock options outstanding
										Weighted
										average
						Weighted				remaining				Aggregate
						average				contractual				intrinsic
		Number of				exercise				term				value (a)
		options				price				(in years)				(in thousands)
Outstanding at December 31, 2017			1,267,221			$	13.62				9.6			$	—
Granted			919,496				9.71
Exercised			(19,830	)			12.28
Forfeited			(394,136	)			12.09
Expired			(32,867	)			13.53
Outstanding at December 31, 2018			1,739,884				11.92				9.0			$	—
Vested or expected to vest at December 31, 2018			1,739,884				11.92				9.0			$	—
Exercisable at December 31, 2018			489,236				13.20				8.4			$	—

^(a) The aggregate intrinsic value is calculated as the difference between the exercise price of the options and the fair market value of the underlying common stock for the options that were in the money at December 31, 2018 . No options were in the money at December 31, 2018 .

Plan 2015

Schedule of Stock Option Activity

The following table represents a summary of incentive unit activity, as adjusted for the Merger, under the 2015 LLC Plan:

		Incentive units
						Weighted-				Weighted-				Weighted-
						average				average				average
		Number of				strike				threshold				grant date
		units				price				price				fair value
Non-vested units at December 31, 2016			971,906			$	5.22			$	5.93			$	1.01
Granted			—				—				—				—
Vested			(73,719	)			4.01				5.53				0.87
Forfeited			(260,145	)			4.19				5.57				1.05
Non-vested units cancelled upon 2017 Reorganization			(638,042	)			5.78				6.15				1.05
Non-vested units at December 31, 2017			—			$	—			$	—			$	—
Vested or expected to vest at December 31, 2017			—			$	—			$	—			$	—

X

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_DisclosureOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

+ Details

Name:	us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=sybx_RestrictedCommonUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=sybx_LongTermIncentivePlan2015And2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PlanNameAxis=sybx_LongTermIncentivePlan2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: