Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (3,942)	$ (1,043)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation of equipment	46	20
Amortization of intangible assets	332	332
Stock-based compensation	389	161
Deferred income taxes		(656)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(293)	(25)
Deferred offering costs	(213)
Accounts payable	71	118
Accrued expenses	(141)	93
Deferred grant revenue		(39)
Net cash used in operating activities	(3,751)	(1,039)
Cash flows from investing activities:
Purchase of equipment	(61)	(34)
Purchase of investments	(495)
Net cash used in investing activities	(556)	(34)
Cash flows from financing activities:
Proceeds from issuance of common stock from initial public offering, net of issuance costs	20,915
Net cash provided by financing activities	20,915
Net increase (decrease) in cash	16,608	(1,073)
Cash and cash equivalents at beginning of period	3,606	7,009
Cash and cash equivalents at end of period	20,214	$ 5,936
Supplemental disclosure of noncash investing and financing activities:
Reclassification of deferred offering costs to additional paid-in capital upon initial public offering	$ 560