Summary of (Unaudited) Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Company's (Unaudited) Quarterly Results of Operations

The following is a summary of the Company’s (unaudited) quarterly results of operations for the years ended December 31 (in thousands, except per share amounts):

2017:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	3,205		$	3,421		$	3,240		$	3,953
Total operating expenses		6,118			6,832			6,421			7,834
Net loss		(2,824	)		(3,320	)		(3,088	)		(3,728	)
Basic and diluted net loss per share (1)		(0.25	)		(0.30	)		(0.27	)		(0.21	)

2016:	March 31,			June 30,			Sept. 30,			Dec. 31,
Total revenues	$	4,604		$	4,122		$	2,642		$	3,163
Total operating expenses		7,114			5,443			5,213			5,938
Net income (loss)		(2,423	)		(1,255	)		(2,523	)		(2,772	)
Basic and diluted net loss per share (1)		(0.26	)		(0.14	)		(0.24	)		(0.25	)

(1) Net income (loss) per share is computed independently for each quarter and the full year based upon respective shares outstanding. Therefore, the sum of the quarterly loss per share amounts may not equal the annual amounts reported.