Condensed Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 12,556,280	$ 9,007,071
Prepaid expenses	587,932	267,711
Other current assets		7,997
Total current assets	13,144,212	9,282,779
Other assets	11,551	11,551
Total assets	13,155,763	9,294,330
Current Liabilities:
Accounts payable and accrued expenses	1,121,519	478,223
Accrued compensation	757,492	933,450
Total current liabilities	1,879,011	1,411,673
Warrant liability	4,506,763	4,095,019
Total liabilities	6,385,774	5,506,692
Stockholders' equity:
Common stock, $0.0001 par value; authorized shares - 50,000,000; issued and outstanding shares - 15,388,325 and 12,350,360 at June 30, 2017 and December 31, 2016, respectively	1,539	1,235
Additional paid-in capital	72,255,601	62,595,546
Accumulated deficit	(65,487,151)	(58,809,143)
Total stockholders' equity	6,769,989	3,787,638
Total liabilities and stockholders' equity	$ 13,155,763	$ 9,294,330

Warrant liability.

No definition available.

Name:	evok_WarrantLiability
Namespace Prefix:	evok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.