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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options vested.

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Stock-Based Compensation - Stock Based Compensation Narrative (Details) - 2014 Plan - USD ($)		12 Months Ended
	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-Based Compensation
Annual threshold increase of authorized shares for issuance		1,500,000
Annual threshold increase of authorized shares for issuance (as a percent)		10.00%
Additional number of shares authorized for issuance	1,500,000
Shares reserved for issuance	7,804,869
Shares available for issuance		1,767,777
Stock options
Stock-Based Compensation
Granted (in shares)		960,432	875,416
Contractual life (in years)		10 years
Stock options \| Employees
Stock-Based Compensation
Vesting percentage		25.00%
Vesting period		3 years
Stock options \| Board of Directors \| Maximum
Stock-Based Compensation
Vesting period		1 year
Performance-based awards
Stock-Based Compensation
Shares options vested based upon performance-based metrics		0	0
Performance Based Stock Options
Stock-Based Compensation
Granted (in shares)			83,280
Contractual life (in years)			10 years
Aggregate estimated grant date fair value of performance awards		$ 663,484
Performance Based Restricted Awards
Stock-Based Compensation
Shares granted		5,000
Aggregate estimated grant date fair value of performance awards		$ 24,850