Condensed Balance Sheets (Unaudited) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 5,405,944	$ 7,679,267
Prepaid expenses	167,364	251,046
Other current assets	11,551
Total current assets	5,584,859	7,930,313
Other assets		11,551
Total assets	5,584,859	7,941,864
Current Liabilities:
Accounts payable and accrued expenses	545,975	1,048,927
Accrued compensation	649,618	1,025,911
Total current liabilities	1,195,593	2,074,838
Warrant liability		3,701,277
Total liabilities	1,195,593	5,776,115
Stockholders' equity:
Common stock, $0.0001 par value; authorized shares - 50,000,000; issued and outstanding shares - 15,682,480 and 15,413,610 at March 31, 2018 and December 31, 2017, respectively	1,568	1,541
Additional paid-in capital	77,409,139	73,202,863
Accumulated deficit	(73,021,441)	(71,038,655)
Total stockholders' equity	4,389,266	2,165,749
Total liabilities and stockholders' equity	$ 5,584,859	$ 7,941,864

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.