The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Subsequent event (Details) - Neos Therapeutics, Inc. 2015 Stock Option and Incentive Plan - shares	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017	Jul. 31, 2015
Subsequent event
Increase in number of shares reserved and available for issuance		1,449,847	803,049
Shares reserved for issuance under the plan				767,330
Subsequent event
Subsequent event
Increase in number of shares reserved and available for issuance	2,483,815
Shares reserved for issuance under the plan	4,277,720